The Doom games are at half the framerate and run like ass, don't kid yourself. Just because they *can* be brought on the platform, doesn't mean they always *should*. Witcher runs at the same framerate on Switch as other systems and it's a great port, since the game was made for 30FPS in mind, but on the other hand, a lot of ports half-ass the framerate or don't play close to how they're intended at all.
The fact RE7 had to be a cloud game for it to run on Switch (And poorly at that) in the system's launch year of all things, kinda goes to show their newer engine and such isn't really up to snuff for Switch: extra RAM can't fix everything, and i'm assuming it was more of a general suggestion for all games in general along with perhaps the usual Ninty exclusives they focused on and were planning to do again. (Ace Attorney, and Monster Hunter).
However I think World shifted their focus entirely: it's clear the old style of MH is outdated and wouldn't be as well-received compared to more World content, so without that franchise, you have... Ace Attorney and Mega Man. Mega Man's next game is still in development and is probably a lock for Switch (there's no way MMX9 would need the RE Engine), and who knows where AA7 is, or AA4-6. It's more of a case of bad timing than anything else, since modern gen Capcom is focused purely on pushing systems to their limits, saving their small scale projects for Mega Man titles and compilations. If they did more stuff like in 2009-2015 with games like Strider/Ducktales/Bionic Commando Rearmed we'd absolutely be getting them no problem. We'd even get the Disney Afternoon collection if the dev kits to Digital Eclipse were sent out earlier than they were (since that launched a month after launch and no way in hell would they have gotten that day and date)
But... Capcom's a RE/MHW machine for now. Can't really bring over things that don't flat out work, which is why they're literally porting everything else that comes out on the other platforms that can work. It just so happens that outside of RE/MHW/DMCV... They don't have much coming besides compilations. It should also be noted that Shinsekai was another small-scale project they made, and that also came to switch: console exclusive in fact.