Switch emulation is quite good, and gets better by the day.
I have no experience with JoyCons unfortunately. I use an Xbox Elite controller + PS4 controllers. They map extremely well to a Switch Pro controller in Yuzu emulator. Launching Yuzu via Steam via Parsec works surprinsgly well to recognise the controllers, despite the occasional hiccup. Smash Bros and Mario Kart are a blast on the big screen.
I am not a Switch owner - surprisingly, I don't think I've even held one - (I am a pretty big fan of Nintendo consoles) - and I know there is some sort of motion control support in the JoyCons? I wasn't sure the extent to which the motion would be required for game play.
I figure in Smash, Kart, etc; it doesn't matter, but I'm just curious how deeply the motion controls affect the gameplay on average in Switch games. :)
Do any major Switch emulators natively support JoyCons the way Dolphin does WiiMotes? (Do JoyCons even use regular ol' Bluetooth the way the WiiMotes do? EDIT: quick Google says yes :) )