I played through the entirety of Hollow Knight on my Switch on the commuter train.
Now the Steam Deck exists and I could do the “PC” equivalent of this. But honestly the Switch is a bit lighter so given a game that runs fine on both I’d probably still pick the Switch.
Also I have played Mario Kart and Smash Bros 2 player in the middle of nowhere, using the detached joy cons. It doesn’t happen often, but it has happened. I have a small adapter that mimics the Switch dock well enough to have it go into TV mode, and I sometimes carry that and an extra pair of joy-cons.