APF had a numerical rating system, it was just hardcoded into the game so you couldn't see it.
As far as numerical ratings, they DO have a huge effect, but the range for which these ratings could play out was just too small. 50-99 is a 49 point scale, so it's hard to differentiate an average guards ballhandling(like in the example you posted; around a 74) from a good guard ballhandling(anywhere from 80-85). The differential in points was just too small for it to matter and translate onto the court.
Thankfully, this year we are working with a 74 point scale(25-99), that will allow us roster makers to make even more of a difference between the players.
There should literally be no need of tiers and classes and abilities if the players attributes are done right and accurately reflect the players ability so that the creme of the crop plays different than a role player.
I know in my game most role players will be 60-70, with the very good role players being 70-76. Then, I'll have the all stars and superstars. That gives me a full 23 overall points(should I need it) to differentiate the stars, and, with MY average players being in the 65 area, there will be tons of difference between them and the very few 90's, 85's, or 80's in the league..
It's really, really huge that the ratings are being expanded this year... and I think people are going to enjoy it a lot.