And that ignores the context completely. Every game can ban stuff. It's the reason why and how they can do it that matters.
There is no way to remove Tripping outside of hacking with has many problems, as listed above.
Banning stuff is not bad whatsoever. If the game can be played with no issues and doesn't need a ban, great. That's not always the case. Rules will always exist in a competitive game, even if we don't make them ourselves. It's a key part of fighting games. You have to win by some condition. Smash is definitely more open. If there was a switch in-game that we could throw to turn tripping off, we would, but that's not the case.
Let's keep in mind that many items are a problem as is, although it's unfair we didn't test them. No disagreements here. Some stages are not cheap, but they cause other kinds of problems, including walk-offs and circle camping. The first one isn't nearly as bad, but it was a general decision to not allow it. It's not an illegitimate win condition, but we don't find it fair. Circle Camping is pretty much no different from an actual stalling. Thus, removing courses that promote that(Hyrule being the most famous example), we prevent the issue from the core. One key thing is that the stalling is what we don't want. Camping is FINE, annoying, but it does often force approaching, meaning the game can keep going. Stalling prevents the game from going on.
We limit those things(mainly stalling) so we don't have to always go to the time limit, meaning we can continue the tourney. It's in fact the only reason the timer is at 8. So tourneys don't last too long.
People don't actually are about stuff being banned, they care about WHY it is. Something gets banned? Eh, happens. We ask why, not complain that is. But the thing is, our complaints is about the reasons, not the fact that it is. All opinions count, but saying "I don't like it" won't help us see your point of view, and is entirely actually worthless to us. It's only good in a poll of some kind.