Fair enough. I apologize for being too absolute in my answers and dismissing your points.
Single wielding and the ap cost has always been weird. How do you balance having only one weapon and no offhand against dual wielding? The lower AP cost just results in a scoundrel stabbing you 6 times in the rectum. Making it do the same damage as dual wielding would just invalidate dual wielding.
In addition, a lot of spells only cost 1 ap, but also have huge effect, such as making fields.
Ap costs need to be looked at.