Replying to myself here to open a quick question which I think hasn't come up too often in this thread: could it be possible to legalise Wii Fit Studio/Coliseum/Galaxy by concocting a complex ban prohibiting walk-off blast-line camping? Something like "if you're the only player in the offscreen magnifying glass, you're disqualified if you stay in it for over 20-30 seconds." Obviously this could be gamed by rapidly rolling out and rolling back in, but maybe that'd give the opponent a chance to score a decent hit on the camper without risk of insta-grab-kill? Just thinking aloud here.
Just like Smogon, most people here won't make or like unnecessarily complex bans.Just how Instead of banning Gunk Shot and Low Kick on Greninja, they ban Greninja, instead of banning degenerate gameplay, they ban the stages.
I personally disagree with both of these and prefer your method, but I see the problems with this: it could open the floogates. Another Smogon example: If they unbanned Blaze Blaziken, people would want non-SS Tyranitar lower, Torrent Greninja lower, list goes on. Or unbanning this could make people want things like the Temples allowed with no camping, or Orbital Gate.
The only exception I can immediately think of (within 20 seconds) is Wuhu, as that glitch requires precise conditions(vs Wario or Villager, in a spot down to the pixel, with timing down to the frame), and even with said precise conditions that will never realistically happen, it has a 1/10 chance of success.