I argue from consistency and proving who the better player is. Imagine if their is tripping and street fighter and i play Daigo in bracket. If he trips into my ultra and I win against him does that make me a better player than Daigo?
The problem with this is that Tripping is too rare for it to be enough of a true issue for us to find it worth hacking.
But you're also 100% ignoring the double standard that comes with it. We are changing gameplay illegally because people can't handle a rare instance of luck. If we change that, guess we can't use Peach's Turnips, Mr. Game & Watch's Judgment, or King DeDeDe's Waddle Dee Throw. Because it's luck.
Not only do we not depend on tripping to win, it barely actually gives out free wins. It cannot be legally turned off and needs to be dealt with by just playing the game. It's as much of a problem as someone getting pins and needles. Or is treated the same. You play the game and continue on. Like everybody else.
Another thing is that there's absolutely no way to turn off-tripping within the original game itself. Thus, we still go into the issue of no longer playing the actual Brawl game. It's a hack, and directly affects gameplay. We must change other characters or stages if we do this. When it comes to any cheats, there is no such thing as a small difference. Every difference makes it another game. No Tripping is exactly the same as having Stages stay on their default settings. They make gameplay different without using what we're allowed to do.
I'd like to remind you that we don't even own the data on the disc, so unless we change data using the in-game options, we're claiming we own it by using hacks. This is not hard to explain, but simply put, we are messing with Nintendo's IP, which is illegal, btw.
Random factors that only impact specific characters only impact those characters. Tripping impacts all characters.
The lip of Final Destination makes it hard to recover and affects all characters. Should we ban that stage? It has just as much effect on gameplay, after all.