It's because fighting games are extremely niche. They are extremely specific in what they do, most series being almost copy pasted from one another. You can capture almost all of the genre's essence with a handful of characters. Of course you can give all characters different movesets, but despite that, do you really see that huge a difference between Ken and Terry?
On the other end, platformers and rpgs are super vague. There's no given structure to those games, and they can feel extremely different from one another. Take... Portal for example, which has clear platforming aspects, and yet is also a FPS and a puzzle game. Which is nowhere near what Mario is all about. Or that Goose simulator game. Or even close-to-home series like Metroid. And the same goes for rpgs, which can go from Gauntlet to TWEWY, to Personna or Dragon Quest, or Skyrim.
And so mix those two together, and you'd have what I assume a conscious decision not to make Smash too close to fighting games. Because it doesn't want to look as elitist as fighting games, and because the design space is very small compared to other genres. And yet at the same time, it wants to celebrate that genre properly too, and it's why Ryu, Ken and Terry made it. Maybe a fourth is coming (to cover beat'em-ups), but seeing how SNK gave almost everything they had, I'd say that was one hell of a celebration, and also where it ends.
In normal circumstances I'd answer every part of your post, but seriously... By reading you it's clear that you won't change your stance about it, and it's really sad, because some of the things you have said are, at best, REALLY really questionable.
But I'll answer one thing: beat'em-ups aren't fighting games.
Imo, all eyes should be on the PS5 event tomorrow
If there is anything Bloodborne and RE8 related, we should start taking notice of it.
Not really. Resident Evil 8 has been rumoured to appear tonight since weeks, and leaks about the game's setting and plot already appeared a few months ago. RE8 appearing at PS5 event is a safe bet. Bloodborne Remastered rumour started 4-5 days ago as well, so it wouldn't be really surprising if it happens.
I've seen the leaks.
And without spoiling anything, the game ruined itself anyways with its "NO FUN ALLOWED" mentality.
Honestly, I find this perspective really dumb. I don't think it's really hard to understand that certain games or genres aren't really supposed to bring joy and tears of happiness. Of course, this is an exaggeration, but I think my point is clear.
It's a game with a heavy emphasis in survival, crudity and rawness. You will feel tension while playing, just like happened with the first game, or just as happens with horror games in general. You're usually tense while playing games such as Resident Evil, Silent Hill, Fatal Frame, and more. You're not supposed to be like "wow haha this funny game is funny" while playing those kind of games, but to feel fear, nervous and careful. If people can or can't enjoy that, that's another matter.
If anything, I'd call it a different type of fun.
Also: TLOU2 previews were out early this month and all the journalists who played it we're constantly praising everything about the gameplay: action, stealth, violence, tension, enemy AI, level design, and more. So it's not like people can't enjoy a game that has a serious and raw tone.