well, you can forbid players to use certain items already, with that new level thingy
pre-defined sets in strat would be awful though, what if i only have 15str, but the helmet has 16 str- however i dont wanna use light gear?
people should use what they can play with the best, and if you know someone is awful you either dont hire her/him, or give them peasant gear telling them to guard flags or something
however, using pre defined classes on public servers would be really great, set these classes up on the website and then choose whatever class ingame - or a custom class, so just the way it is now, choosing all gear pieces individually