They do know the difference[0][1][2]. I feel like gamers are notorious for complaining about fidelity issues and frame rate issues. I’m not sure why you would think they don’t understand the difference. The reason people complain about switch frame rates is because it’s often low fidelity games that still can’t hit a consistent 60 FPS.
"they" as in hardcore hobbyist with multi thousand dollar rigs who spend their time talking on old game forums. Sure, there's a minority that cares. But those gamers aren't why Fortnite sells like Fortnite. They aren't why the Switch is on pace to be the best selling console. They aren't why the indie market is viable as a potential livelihood if you get a bit lucky.
But this is all tangential. They may have all these fancy hardware but they either have no understanding of hardware, or are simply tonedeaf. If you're expecting the same specs out of a 2017 smartphone compared to a PS5, let alone a top end pc build, there's simply not much more I can say. Learn that a handheld has more considerations than a towering console when it comes to being a proper handheld. It's a 720p specc'd screen, of course any 3d game trying to be modern won't bother going higher.
I never saw people complaining about a 3ds not having ps4 performance, so this to me seem like a recent sense of entitlement or ignorance amongst said enthusiasts. The Switch doesn't have a GPU dock (which would cost more than the console itself, even if it didn't include a GPU), so just because you project it to a screen doesn't mean it's suddenly console hardware. You could project a PSP to a screen back in the day. Nintendo just made it work out of the box.
[0]: https://gamefaqs.gamespot.com/boards/189706-nintendo-switch/...
[1]: https://www.nintendolife.com/forums/nintendo-switch/the_fram...
[2]: https://www.reddit.com/r/FortNiteBR/comments/gyn32c/seriousl...