We’re also committing to supporting Vortex on SteamOS. We’ll be targeting vanilla Steam hardware like the Steam Deck and Steam Machine. We won’t be officially supporting any other configurations, but as Vortex is an open source project community developers will be free to extend support for their preferred Linux distros as they please.
The immutable part is only for the main system. You can run any application, in example with a user script to install and setup everything in home directory. Or AppImage off course.