The problem is the 1111 rule was a completely arbitrary rule made early in the game lifespan. I'd rather side with the dev's arbitrary decision (i dont think it was arbitrary) then a player's arbitrary decision, especially one that restricts great competitive content into the community.
Given the choice between one or the other, I would rather side with the arbitrary decision of a community of players dedicated to making the game as fair as possible, in order to give it as diverse a meta as possible, than one made by game developers before the product was released, for reasons mostly unrelated to the meta.
As previously mentioned, the "customs aren't custom lel" rule of Mii Fighters is to promote diversity between Lonk and Cloud. If you're talking official Nintendo arbitration, then Mii Fighters should be banned altogether from non-customs - as For Glory's ruleset is the "official" competitive one. And Mii Fighters are only allowed in... wait for it...
custom Glory. Given that Super Smash Bros. is the
only online game with Miis where they could not be used in matchmaking until very recently, (hell, Boom/Fortune Street
required that you use a Mii for online play) and even now only in Tournament mode, and not in the For Glory regular tournaments, only the For Fun, Custom Fun, and Custom Glory ones, Nintendo's worry wasn't about perverted "cougars" playing as Vagina Face around little boys and girls, they were worried about
custom moves. Even games such as Mario Kart Wii where the Mii characters had statistical differences from the rest of the cast which made them utterly unique characters didn't ban or even restrict their use, outside of client-side filtering which merely replaced them with default Guest Miis anyway.
But we're not Nintendo. We're the competitive community of Super Smash Bros. - and we make our own rules. And my vote is to trial this idea in special tournament sets and see how popular they are. Because I
like the idea. (because more custom moves is more better, in my opinion) Just not the whole "let's change
every rule ever without letting people playtest it first" thing.
But there's a difference between ban worthy and unfair.
Something like Sheik's Bouncing Fish could be seen as "unfair", but it isn't harmful to the meta and it isn't ban worthy. Items are "unfair" but they do cause harm due to their randomness and are usually considered ban worthy to most people.
Miis do not fall into this category of being unfair and ban worthy I feel. I do agree that it's an odd exception but it's built into the game. There's really no reason to go against it because it doesn't cause any harmful outcomes to tournaments.
The 1111 rule for Miis is absolutely arbitrary, it's a compromise that shouldn't be there when the in-game logic allows it. I'm in agreement I'd rather side with the developers' likely intention here especially when it removes 3 characters' uniqueness to the meta.
Don't make this about subjective "unfairness" versus "ban worthy" when "ban worthy" only means "objective unfairness" anyway.
Sheik is the only character with Bouncing Fish - but
every character has a down special 1 which can be used in any match. Which is why the Mii Fighters' advantages in this area could be seen as unfair. But we won't know this unless we
try.
The pro and anti arguments on this issue are both valid. It's a subjective issue anyway.
So, I say again. This is a call to TOs to trial this proposed ruleset, and see how the playerbase likes it, and what impact it has.
I already said I have no personal opinion, because I favour rulesets where every character that has custom moves can use 'em so heavily.