Arguably, there is some difference. Grand company seals and desynthesis can yield materials necessary for upgrades to currently existing equipment, like the relic quests, but I personally believe it's a sort of fine line. Other people need access to that gear for the same reason, even if it's not their class. But, as I said, it's not an immediate statistical upgrade, so you don't NEED it, in so far that getting that piece of gear will benefit anyone around you. But that's just how I look at it. Other people see it differently and that's okay. I'm always amazed by the intolerance for differing opinions.
