The problem I see with power creep is that most of the numbers in the game are abstractions, so its easy to increase them without really thinking about it. Imagine for a minute that instead of Infantry Fire you had values for things like range, rate of fire, and shot dispersion (Obviously you wouldn't want to do that because it would make the game too complicated, but bear with me for a moment). In that case everyone could see if a modifier was OP or not because you could judge it against firearms technology of the period. On the other hand, if we're just talking unit pips you can wave your hand and say "This country won some wars, so give them a bonus". Its like that for most everything in the game and (as others have mentioned) as lot of people want those bonuses for their favorite tags.
- 4