Q u o t e: I dont know why you did anyway. but i played it because i got more skillpoints, so i could make my unique build even better.
Alot of fun with synergies.
An before you say "thats the same as now" : no it isnt.. because placing that one vital skillpoint was sometimes a hard decision whereas now....
But, but, but, the enemies just got more difficult so you didn't feel like you were getting any better and when you got to hell it felt like hitting a brick wall. See what I did there?
Realistically though, you'll find better gear and also better runes, which will provide that customization you're looking for to make your skills better. More skill points gave more charged bolts, higher ranked runes give more magic missiles.