The answer to your question is in your comment. The reason is that those devices are designed to run emulators (usually nothing past gamecube/ps2 era). They run Android because Android has support for emulating software, but the chips used in those devices aren’t designed to run current Gen games nor are they usually designed to run most Linux distros.

Although someone could try to do it, but if I had to guess it’s more work to do it right (Valve made a custom OS for the steamdeck).