Sounds like all the other platforms are getting the "oldgen" version of the game.
KRAW
Seems like you answered your own question. Arch is not for people who want something that works out of box. If you want a GUI, suspend on lid close, sleep on idle, etc. by default, don't do Arch. You have to be prepared to debug issues, configure lower level OS features, and read a lot through the wiki and web searches of you are going to use Arch.
Hopefully sway will eventually be able to support your setup!
Arch Linux + Sway
That really depends on your definition of "sane defaults." Even a lot of the computer science professionals I work with wouldn't consider Arch Linux defaults as sane. I picture sane defaults to include a lot more basic functionality that Arch doesn't have out of box (automatic suspend, desktop environment, lock screen, etc.).
I use Arch for the exact same reason you do though. Once you get past the tedious stuff like setting up your networking stack, setting up idle suspend, etc. it's nice to choose whatever WM/DE you want and customize it how you want.
The Switch is going to be "oldgen" which I assume is similar to Fifa Legacy conceptually