Well, it's partly a result of the skill system allowing you to easily multiskill everyone too.
Acquiring a whole suite of new skills is so cheap.
I can add a point of warfare to my rogue and now I've got access to battle stomp, battering ram, and whatever else.
Similarly, 1 measly point in scoundrel or Pyro gives my fighter haste and adrenaline.
Want my rogue to go telephoning people around... No worries give him a point of aerothurge. Maybe some magic cc too.
