At bold: Very true, that's one big thing why I love Nintendo, they leave most of the bullshit out. I mean they even sold Super Mario Run for $10 with no additional costs - but obviously people are too stupid to see the good deal in it. During the whole PS3 era I never paid for PS Plus and for PS4 it was not before this year that I paid for it (because I thought Fall Guy would be a game my girlfriend would like, you got it for free with a PS Plus account, but it was no game for her - back to Super Mario Party).
Back to topic: Obviously we have a different opinion about core and hardcore gamers and the difference between them. Let me try to explain it from another point of view: There are player types who don't like Nintendo games at all, simply none of their IP's. But they like AA-AAA 3rd party games. Some like Action-Adventures with realistic graphics like Assassins Creed, Tomb Raider, GTA, Red Dead Redemption..., some like shooters like Call of Duty, Battlefield, Destiny, Rainbow Six: Siege,... others prefer racing games like Dirt 5, F1 2020, Project Cars, Need for Speed,... and others like RPG's like Final Fantasy, Cyberpunk 2077, Fallout, Persona 5,...or fighting games like Street Fighter 5, Soul Calibur, Dead or Alive, The King of Fighters IV,... or realistic sports games like NHL, NFL, UFC, Tony Hawks Pro Skater 1+2,...and many more. All these games are not available on Nintendo Switch. If they were, some (and we're talking about millions) would buy or at the very least be tempted to buy a Nintendo Switch. Again, why should they buy one if they already own a superior version of the game on PC/PS4/PS5/XOne/Xbox Series S/X? The answer is the same as before: Because it's lazy and therefore attractive to play those games comfortably on the couch or bed, plus as an additional bonus you can play it on the go.
Granted, if it would be possible (and in reality it's not possible) to have a super high-end hybrid console with all the bells and whistles, good battery life but without overheating and ports from PS5/Xbox Series X/S would technically be easy and cheap to port, surely Nintendo would bring out such a hybrid and surely virtually all 3rd parties would bring out virtually all of their games to the Nintendo Switch (assuming that it would continue to sell like hot cakes). Certainly, Nintendo feels no bitterness against 3rd party AA-AAA games.
It's plain hope on your part that there are millions of gamers out there the way you describe them. To me, your post sounds a lot like you are trying to come up with some kind of reasoning that would justify Nintendo doing something that you personally would want to play on Switch (more AAA third party games), but there's no evidence whatsoever to support your post.