I'm in a similar boat, I have a steam deck and a modded switch that I can transfer games/saves over to my PC and deck.
The switch still gets use for the following reasons:
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online play (when the deck is not booted into custom firmware)
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some games don't run well when emulated. This is getting better all the time, but is still an issue, especially with newly released games. I wasn't satisfied with ToTK performance on release for my deck so I ended up playing it exclusively on my switch. Also you need shader caches for games to run well, and the games stutter and hang a lot while generating those in new areas.
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the games that do run well still aren't very efficient in terms of power consumption, and you'll get longer battery life out of the switch for most emulated titles.
The Deck does have significant advantages over the switch, like bigger screen, bigger storage, more comfortable to hold, PC games, etc. If there's a PC port of a switch game it will run better on deck than on switch, with comparable battery on comparable graphics levels.
Good Linux ports are great, but realistically most of the Linux native games in my collection run worse than if I force the same game to run through proton.
Good native versions take more work than most devs are able/willing to give with the size of the Linux community. If devs will actually give attention to and make sure the proton versions of their games run well, that's a better outcome than the state of Linux gaming up until now.
And hopefully Linux user base will grow enough that we're worth actual maintained native ports in the future, but until that happens we don't need to be hostile towards devs for using an easier method to make sure their games are available on Linux.