After more game time, I'm now pretty sure of it... A character with a little 21 int deals 1.7k AOE with a 2source point necro skill, while the 3 source points rogue source skill dealt 1.8k crit on a single target with 40 finesse...

Let's count the benefits:
Force: 1 schools ~~ 13 skills (welp)
Finesse: 2 schools ~~ 26 skills but 13 ranged and 13 rogue.

Polymorph? benefits everyone :p
Summoning?

Int: 5 schools ~~ 110 skills in total (most of the crafted skills require intelligence)

Let's just say that for the fun of it, mages have much more potential :p

Oh, and mages also benefit from the high grounds ^^'

Could actually bee interesting to have multiple fighting schools "the way of the sword/axe/mace/rapier" , the way of the up close ranger or the far away sniper