I'm all for this, or at least for a level of restriction. I think anything that does slashing should at least be restricted to gladiator or marauder. I don't think some kind of slashing move works on pugilist. It just doesn't make sense to me. But it would simply be easier to restrict it by class, which would inherently give each its own strengths and weaknesses, to be balanced out in the future. Everybody could still solo, but it would affect partying for a little while. I definitely love the level of customization in this game, and would be all for having more passive abilities learned/used for customization, but the actual abilities themselves should have a little restriction and/or be combined to make it more difficult to choose.