Perhaps they should add a system with three paths for each weapon. 1 offensive, 2 middle path, 3 defensive. then let the player choose for each slot what path they want.
For example:
Elementalist picks first 3 skills to be offensive dealing some smashing dmg. Then picks def path for last 2 which are completly different from offensive path. perhaps dealing dmg debuff to enemy or buffing missile avoidance or something.
would def add diversity amongst players since not all only wants to play dps only.