They should have the inverse of the power consequences for when you are above the required level. So in short the advantage caps out so the game doesn't get trivial. Other things like damage bonuses only apply to precision damage where applicable. Generally rewarding only accuracy and proficiency. It's an action shooter first and foremost after all. The key thing is to continue to make the game without thinking about it. The moment the game's difficulty and balance is adjusted to accommodate it the feature becomes nearly pointless. Oh and we do keep growing as players just not numerically because the game is an action shooter first. Meaning when new tools are added to our arsenal like bows, or subclasses we grow in that way.