Are there any larger implications of allowing a variant rule Ability Score Improvement/Feats in a multi-classing campaign?
In one campaign we have all multi-class players. There has been a frustration about having to take a 4th or 8th level in a class for the sole purpose of having access to an Ability Score Improvement (ASI) or a Feat.
I want to suggest we have a character level progression system instead of class, when it comes to ability score improvements and feats. This seems simple enough. The majority of classes get an ASI or feat at levels 4, 8, 12, 16 and 19, with the exception of a Fighter who also gets this at levels 6 and 15.
The variant rule would be that a PC gets the option of an ASI/feat when it reaches character levels: 4, 8, 12, 16 and 19. If the player chooses to develop into the Fighter class, then that PC would get an ASI/feat upon reaching Fighter level 6 and 14.
There is a similar mechanic with cantrips for mult-classing players, where the upgrades depend on overall character level, rather than class level (PHB, p.164).
Variant Rule: Ability Score Improvement, or Feat
When you reach 4th level on your overall character level, and again at 8th, 12th, 16th, and 19th level, you can increase one ability score of your choice by 2, or you can increase two ability scores of your choice by 1. As normal, you can’t increase an ability score above 20 using this feature. The increase is based on your character level, not your level in a particular class. Using the optional feats rule, you can forgo taking the Ability Score Improvement feature and take a feat of your choice instead.
In addition, if you train as a Fighter, you get an Ability Score Improvement at upon reaching 6th and 14th level in that class.
Would this create any great unbalance? I can’t see it, but I might be missing something.