If I may say this about 4e.. this was part of why I think the math fix feats were a mistake. There were so many power bonuses, at that point that they were unnecessary.
I think the math fix feats were necessary for those groups that could not get consistent power bonuses. I think that power bonuses are too high to begin with. I think that monster damage was always too low and even the fix was too low. I think that monster options were too limited. PCs have more than a dozen options each going into an encounter at low Epic, but monsters have 3 each. If they are only going to have 3 each (to keep it simple for the DM), then those 3 options should be more awesome than the PC's basic options (not necessarily more awesome than the PC's Daily options).
All in all, I think that the math and the power of effects was never balanced to begin with. If there is anything that I hope they do with 5E, it's to create a set of meta-game design rules for designers so that the game doesn't spiral off into a curve (either easier or harder) at some levels because a game designer doesn't know what the heck he is doing and doesn't have guidelines to do it properly like what happened in 4E. There are first level Daily powers that should be 15th level Daily powers and these were not introduced when 4E was brand new, but introduced when 4E was out for a year and designers should have known better by then.