I dont think its fair at all to completely remove it just because of THAT, honestly not. They take the risk before they get it and should be prepared anyways. And even if such legendary user "needed" it for this optional thing they couldve handled it another way, making it tournament challenges only if you carrying a legendary or having a cooldown after each battle, ikd, just so many other way to get around that.
Not sure how that actually works but at the same time it doesnt effect the main issue i currently have with this game, is it? :|