

Welcome back to the dark side!
I always find the Decky woes way overblown, they only happen when a major Deck release happens - and even then all you gotta do is reinstall Decky on desktop mode (or wait a few hours for an update).
It never deletes settings.
But, yours looks beautiful now. I esp love the Halo art!!!
Yes, absolutely.
Even better, unlike Steam you own the of line installers, so you’ll always be able to own that game, even if GOG itself closed down.