I never said that's all you had to say. I simply summed up your point and and countered it.
You summed it up, that much for sure.
In Mario Kart, the character you play as
does have a difference in the form of different weight-classes affecting different attributes. Either way, if Miis are applied to Smash Bros. the
general consensus is that Miis would be the one customizable character that can have actual changes to their moveset and/or their stats. What if we just give them all one set moveset, you ask? Miis lose the appeal of being customizable outside of aesthetics, given, but the fact still remains that the casual audience, as
everybody else outside of an already existing video game fandom, will choose Miis. Brawl was considered more casual of a Smash entry, but at the very least it forced players to be familiar with characters from actual franchises, one of the whole points of Smash Bros. in the first place. Allow Miis as playable, and now a lot more new players won't even bother playing as "that blue haired guy with the big sword" or "the weird pink thing that sings" when they can just gravitate towards the character they're already familiar with: themselves. Which leads to another problem. Casual players are not devoted or educated like we are. If we have the same movesets regardless for Miis, the casual players will get bored, feel like they already got the most out of Smash Bros., and move onto the next Mii Party or Wii Fit or Just Dance or whatever meets their soft gaming appeal. Casuals will look at Smash Bros. as a casual game and nothing more, which hurts its image more than helps it in terms of expanding audiences. It's easy to think there's more faith to be had in these type of gamers than I'm letting on, but the truth remains that they really are this straightforward for the most part.
Now what if, for example, instead of just playing as Mii, a new player tried a character like Samus or Ness? "Whoa, I actually like this guy!" they say, feeling like they can invest in someone other than an avatar of themselves. "Wait, this guy has his own video game? I wanna try it!", and so they do, giving more revenue to Nintendo, creating another actual fan for the series, and solidifying their connection to the character in Smash Bros. "Maybe I should try another character, since the last one was definitely worth it", they think. Suddenly Ike is given a try. Or Fox. Or Mega Man. The cycle repeats and a Nintendo fan is made out of one game alone. That's the magic of Smash Bros.
Compare Miis instead, who are automatically a part of three Nintendo consoles now and the "first" characters you'll be familiar with as a casual gamer. If they're in Smash Bros., that experience is lost in that they already have someone they know they can stick with. "I know Mii better than that bad-fat-Mario, why would I try him when I could be me?" The difference between casual players and players who already have a franchise to stick to (i.e. someone who's only played Pokemon prior to Smash Bros.) is that, being of the archetype of playing an actual series beforehand, the fan will be (usually) more open-minded towards trying other characters for the reason that they have overcame the unfamiliarity barrier beforehand.
So yes, a lot of this is guesswork and psychological prediction, but if trends from the past hold true for the present, casual players should not be allowed to play as Miis in Smash Bros. lest they get robbed of the barrier-breaking experience that is Smash Bros. Wii Fit Trainer already handles the same type of barrier Miis would for casual players, the difference being that Wii Fit Trainer is not the player themselves. It is, in a loose sense, the same type of principle in game design that distinguishes
Balance for Skill, only in a more meta, conceptual way rather than mechanical.
Now even if you have a counter-argument, even if you believe everything I just said is faulted in logic, can you leave this be? If you want to mercenary out others to use the same logic as you, so be it, but I really don't feel like talking to you about this if you're going to use the same arguing techniques you usually do. I'm not looking to force-feed others that I am right like you have been known to do. I'm looking to
convince others, voluntarily of their own will, to agree with me. Regardless of what I say, that won't be happening with you.