If I'm a Fighter and I'm putting points in "Soul" to deal more damage, I think I'm even more confused than a Wizard stacking points in "Might."
They could have just called it Power or something equally interchangeable. "I put a lot of power behind my sword swing," or "I put a lot of power into my fireball." "You used your powerful, rippling thighs, glistening in the noon day sun, taught with fury and righteousness to dislodge the menacing boulder off the sickly old crone on the side of the road. She gives you one gold coin."
That said I don't find Might itself to be all the offensive or misplaced as short hand for Mental and Physical prowess.