I don't think the argument is stupid. Majoras Mask is one of my fave games ever, yet I don't share the same love for Skull Kid as his supporters to the point it wouldn't bother me if he didn't make it in.
My question to you all is, what specific things about Skull Kid make you love him so much and want him in as a playable character?
I understand why people might like him. He assumed his friends didn't love him any more when they left him behind, and he became a loner before meeting Tatl and Tael. And he became a victim of Majoras Mask. And at the same time, he's imperfect. Even before getting the mask, he played tricks on people, which led to him stealing the MM. (and Skull Kid with the mask looks cool).
Beyond that, though, I don't understand the desperation to have him in as a playable character. You don't even fight Skull Kid as the final boss. You fight the mask. Skull Kid was just a puppet.
When I think back on the game, I just see the MM as the face/image of the many things I loved in the game overall, but I don't have a particular love for Skull Kid.
As a fan of the game, I'm satisfied with any MM representation, but wouldn't be upset if he doesn't make it in. So, out of curiosity, what are some reasons you'd want him in as a playable character so badly?
It's not a weird question at all. Majora controls Skull Kid, so technically you are playing as Majora, not Skull Kid. My favorite thing about Skull Kid is his presence. In
Ocarina of Time, Ganondorf makes a few brief appearances, but you don't really face him until the very end. In
Majora's Mask, you are constantly reminded of what Skull Kid is capable of when he wears the mask. One only needs to look at the sky. His 'pranks' follow you everywhere.
Also, while Skull Kid doesn't have much screentime, I find all of his encounters to be extremely memorable. Every time he shows up, Link is in grave danger. I never really got the feeling that someone like Ganondorf was imposing, because you usually face him at the end of the game, when you have become as powerful as possible. But Link encounters Skull Kid multiple times and there's often a sense of helplessness to it (becoming a weak Deku, the moon almost crashing).
I will admit that I don't really like Skull Kid when you separate him from the mask. But that works both ways: I don't like the mask without Skull Kid. But there's nothing wrong with that. They're a team and that's what makes them memorable. We have multiple characters like that in Smash (Rosalina & Luma, Duck Hunt, Ice Climbers) and I think people would care less about them if you took a member away.
My question comes from those who think Skull kid supporters are mistaking their love for Skull Kid when they actually only want playable representation for MM, and Skull Kid just happens to be the best character to rep the game, not someone they actually care about."
While I just explained why I'm fond of Skull Kid and the mask, I admit that I really want playable representation for
Majora's Mask, and that I would easily accept other characters from that game, like the Happy Mask Salesman, Odolwa, Mikau or even Majora's Incarnation herself. But as you said it yourself, this is not a realistic expectation, so Skull Kid would be the most feasible choice. But once again, I don't think there is anything wrong with that. There are people who want a
Rhythm Heaven character, but have no idea who it should be. They just want to see a game they like having a playable rep, and most of them won't care if it's Karate Joe, Marshall or the Chorus Men. People can have all kinds of reasons for supporting characters, be it nostalgia, popularity, curiosity or representation.
Hope that answers some of your questions.