Alright, going to start adding my thoughts to these threads, now. I was discussing this with Mal earlier and explained to him the one concern that I had with this, which he has addressed by saying that the Combat Ability that allows Matt his dresspheres has to be constant across all classes that he obtains, so they ALL have one ability set taken, regardless.
Now, the reason as to why I have no further issues than the one that Mal has already addressed to me is because this isn't giving Matt a discount. In fact, it's actually making it harder for him to keep up with every other character on the site. Since he needs to spread his acquired combat abilities out over every class he obtains his versatility makes his overall character growth slower than others.
Of course, you could argue that he could just mass-boost one class and then move onto another, but what would be the point in that? He'd basically be gimping himself if he wasn't keeping his ability gains spread out over all of his classes as it wouldn't be playing to the strengths of the character for him to do that.