The distribution will be harder to remember for players, especially as they get older
Seriously, there is an option in one of the RM2 companions, I think it's called "smooth stats" or similar. We tried this once, for the same reason you did but in the end we found that the added detail, in this particular case, wasn't worth the increase in complexity.
Basically, every time a stat changes you have to look up what the new bonus is, and that turns out to be annoying and cumbersome. With the 75/90/95/98/100 division, at least there is a chance of it staying in memory...
There is one other thing I can think of right away, and that is stat modifications, such as this background option from RM2/C:
Increase one stat by 2 or three stats by 1 each; both temporaries and potentials (to a maximum of 101).
The above special is only worth something (sometimes) because the +1 or +2 stat can be worth a great deal (+5 or +10 bonus).
If you do the 'smooth' stat bonus thing, specials like this one become sort of worthless all of the time (but you could always decide to deal with that as well, of course, by changing or removing such specials).