That is totally another problem but it does exist somewhat in PoE. Though not exaggerated.
Fighters, barbarians, monks, paladins, rogues they all probably can mop the floor with spellcasters one on one, but in group fights casters get a distinct advantage because they have time to lay down a couple of spells before they get their faces full of axe.
And yeah, number of active abilities for "non-spellcasters" is really low. Especially distinct and effective abilities.
As I see it "martials" should get soul abilities that work through their body or equipment. They already have this but in a really restricted manner.