c.f. 3e conversations about bonus stacking in combat. A number of people say "what is the problem, it is just doing a bit of adding up, here is a tip I use to help me". The overall issue though was that it was just a pain doing lots of small simple bits of maths all over the place. It wasn't too complicated for people to do, it was just an unnecessary complication that most people felt undermined the fun of the game. Interestingly it seems that WotC research agreed with that, because they decided to do something about that for 4e (along with tracking durations, etc).