If you can't play with items on the wackiest stages out there, you can't play Smash Bros. Tournaments should be held on Random stages, with Random items. It's the only way to truly gauge people's skills at the game. Occasionally a character may get an advantage in cerain situations, but they can also wind up in situations which leave them at a massive disadvantage. Playing Final Destination (or even Battleground, for that matter) with no items isn't playing Smash Bros.