Why metamagic feats for spell-like abilities that Warlocks use are so much stronger than regular metamagic feats at early levels?

Warlock is able to stack maximize and empower spell like abilities as early as level 6 without increasing effective caster level, which is not true for maximize/empower spell feat (for Sorcerers and Wizards)

Warlock is able to maximize and empower their magic items with that boost their eldritch blast such as gloves of eldritch admixture, which adds 4d6 to their total damage, but it doesn’t hold true for regular metamagic feats.

How come there is such a power gap between metamagic feats for spell vs spell like abilities?