I think now I understand it, the other problem with that is that the loot dropped by the boss will be usable for most of the classes so basically at all loot drops everybody will chose Need at the dice rolling. Because you are trying to reduce the amount of type of weapons through this system, and people will have to search weapons by their stats instead of by type.
First of all in that mmorpg players do not look for their objects depending on the statssThe second thing about this is that it is not something that of a buff or nothing, it is only DECORATIVE and I emphasize again DECORATIVE, it serves to identify the class with which a player plays
So instead of creating very complex new weapons, the only thing they have to do is a minimal decoration that accompanies this magic mesh.
Apart from all this I do not understand why you are talking about the stats , if this is due to transmog, there is no problem because you can literally change everything in transmog zone.