Powered by [EmulationStation Desktop Edition](https://es-de.org), RetroArch and standalone emulators allows you to import your favorite retro (but even not-so-retro) games in a tidy enviornment without flooding your Steam library.
Means that all the configurations are ready and tweaked to get the best graphics and perfomances on the Deck itself without having the hassle to choose, install and congifure tons of emulators: just put your games in the roms folder, provide your own bioses and you can start your games.
No, no partitioning or format is required: RetroDECK, diffrentely from 351ELEC, Batocera & co. comes as a flatpak: just install it as any other application and launch it from your desktop or Steam library.