X kinda gets a pass in my book with converging stats on the sphere grid as that isn't a problem for the first, oh, 100 hours or so. It only becomes an issue if you're really going for all the end game content; dark aeons, monster arena and so forth. Technically FFVII had the same problem because you could just get master materia on everyone. I don't feel these drawbacks are really drawbacks for the majority of the game.