I think its ridiculous that people are citing repetitiveness as a reason to not accept this game. Many of the RPG speed runs on this site have much worse cases of repetitiveness that aren't even necessarily seen by the person watching the movie in the luck manipulation that happens behind the scenes.
Of course, in those games, you can't really sack time for entertainment and thus, they HAVE to end up repetitive, but in that case, shouldn't those runs just not be published at all (since entertainment is one of the key goals of this site)? If the entertaining part of those runs is supposed to be the amount of time that they're beaten in, then isn't most of the entertainment value found in just looking at the text that says "beaten in x:xx" ?
Honestly, the way Smash is structured, it really is more an action game then a fighter, and it just has a more obviously seen optimal method of beating each stage in the game. At least in the way the game is structured in the 1p mode.
Smash is also different from traditional fighters in the fact that you have a different stage each time, instead of a vanilla flat ground, and even different matchups from the normal 1v1s that occur.
So why is Smash not accepted on grounds of being repetitive and RPGs are OKed?
I think its because people on this site, and probably a good majority of people with casual knowledge of TASs already have an idea of the amount of luck manipulation that goes into RPGs. And they watch said videos with this concept in mind. If you go into a RPG TAS with the mindset of "oh, well, he's just getting lucky every time." then that run isn't going to be interesting. At all. Similarly, if you go into this speedrun with the mindset of "oh, he's just doing the same move sequence every time" its not going to be interesting either. The problem is that Smash is seen by many as a shallow game that doesn't require much planning/manipulation. The amount of technical skill that is actually displayed in the video is incredible but is lost at the people who never really got down and dirty with the more indepth mechanics of the game.
Thus, I'm voting yes.
Edit: Guess I can't vote yet. Oh well, just wanted to rant.