Can you stealth against tremorsense?

I am confused to the interaction between the monster special ability tremorsense and skills of perception and stealth.

Specifically what my issue is that tremorsense gets to "automatically pinpoint the location of anything that is in contact with the ground".

When reading the perception rules you have "Creatures with the tremorsense special quality have a +8 bonus on Perception checks against creatures touching the ground and automatically make any such checks within their range".

The action for perception is "Most Perception checks are reactive, made in response to observable stimulus. Intentionally searching for stimulus is a move action." This could also be worded as "Most perception checks are automatic". Now this doesnt include pinpoint, which does matter?

So the automatically part is talking about the action to make the check, they dont have to focus or take time, it just happens. This is further supported by perception getting a bonus of +8 as long as both are touching the ground, otherwise, why bother giving a bonus to notice things if you are always successful in noticing things touching the ground within your range?

So, could you use stealth to sneak up on something ONLY using tremorsense?

Can Tremorsense replace sight?

This question it prompted by the recommendation of Ryan C. Thompson in relation to their answer to an earlier question of mine.

Does tremorsense, allow a monster to effectively "see" other creatures or does it only indicate location?

The first option would have tremorsense function the same as blindsight with the exception that it doesn’t work on flying creatures and can "see" behind walls and other obstacles.
The latter option would function similarly to locating an invisible creature where you know the creature’s location but it remains unseen.

Related:
Does Tremorsense allow Attacks of Opportunity while Blinded?
Is a character unseen by tremorsense while jumping?
Blindsight and Tremorsense for a Blind PC?

Is a character unseen by tremorsense while jumping?

Tremorsense is described as:

A monster with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same ground or substance.
Tremorsense can’t be used to detect flying or incorporeal creatures. Many burrowing creatures, such as ankhegs, have this special sense.

Assuming that tremorsense allows a monster to "see" other creatures that are touching the ground as is covered by option 1 of this answer and also assuming that the monster is unable to see the character except via tremorsense, does jumping cause a creature to be unseen by the monster?

As an example Raflannan the thief is facing a fearsome Ankheg in an area covered by heavy fog. Raflannan runs and jumps firing his crossbow at the Ankheg while midair. Is Raflannan’s attack rolled at disadvantage due to not seeing his target or is it a regular roll because the advantage of being unseen cancels out disadvantage?

Does Tremorsense allow Attacks of Opportunity

Can a monster with tremorsense that is blinded make attacks of opportunity when an enemy leaves its reach?

Tremorsense is described as:

A monster with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same ground or substance.
Tremorsense can’t be used to detect flying or incorporeal creatures. Many burrowing creatures, such as ankhegs, have this special sense.

There is a Sage Advice ruling on blind opportunity attacks that specifically mentions blindsight but does not mention tremorsense

An opportunity attack is triggered by “a hostile creature you can see”. If you can’t see an enemy, you can’t make an opportunity attack against it.
Creatures with blindsight are an exception to this rule, because that ability lets those creatures “see” within a certain radius.

As long as the target is touching the ground does tremorsense essentially work the same as blindsight?

Does the Arcane Archer’s Shadow Arrow inhibit blindsight, tremorsense, and/or truesight?

Shadow Arrow:

You weave illusion magic into your arrow, causing it to occlude your foe’s vision with shadows. The creature hit by the arrow takes an extra 2d6 psychic damage, and it must succeed on a Wisdom saving throw or be unable to see anything farther than 5 feet away until the start of your next turn.

Blindsight:

A creature with blindsight can perceive its surroundings without relying on sight, within a specific radius.

If a creature with blindsight (like a Flying Sword) fails its saving throw against an arcane archer’s Shadow Arrow, is its ability to perceive enemies via blindsight restricted? Would creatures with truesight or tremorsense be handled the same way?

It seems to me that this is fairly straightforward, but upon reading this question about opportunity attacks, there seem to be cases where the word "see" is used more generically as all forms of perception.

Does tremorsense see through Pass without Trace?

Scenario: The PCs have Pass without Trace active when they walk through a tunnel where an Umber Hulk has been waiting behind the wall in ambush for prey, using its tremorsense.

Question: Does the Umber Hulk detect the PCs in spite of Pass without Trace because they are in contact with the floor?

Pass without Trace:

A veil of shadows and silence radiates from you, masking you and your companions from detection. For the duration, each creature you choose within 30 feet of you (including you) has a +10 bonus to Dexterity (Stealth) checks.

Tremorsense:

A monster with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same ground or substance.

Does a blind creature with tremorsense still have a 50% miss chance?

A creature with the extraordinary ability tremorsense

can automatically pinpoint the location of anything that is in contact with the ground.

Does pinpoint here mean an otherwise blind creature with tremorsense can locate a creature with perfect accuracy, or does pinpoint here mean an otherwise blind creature with tremorsense can know an appropriate creature’s space but suffers a 50% miss chance, as when locating a creature that’s invisible?

Tremorsense and Boots of Elvenkind

Tremorsense detects material-based vibrations. Obviously, this refers to sound waves (“tremors”) in the real world. Interestingly, it specifically excludes flying creatures, which could be interpreted to imply that it excludes air-based vibrations.

Wearing the Boots of Elvenkind means the wearer’s footsteps are silent — i.e. produce no vibrations. That could be interpreted to mean sound waves through the air (only), or all sound waves, including those through the ground, which could otherwise have been detected by tremorsense.

(Of course, magic and it being a game mean any or all physics can be sacrificed for the sake of the game!)

Are there any relevant rules or clarifications I missed?