GameImage basically just lets you fuss with getting the games working on Desktop first, then turn that into an AppImage file that you can just copy straight to the Deck.
So just for my understanding, what's the benefit of getting the game running on desktop first, rather than just setting things up on the Deck itself? If you're doing this for several games does it not mean you're creating multiple copies of the emulator within each appimage and taking up more space?