Great! Competition is wonderful.
To be fair, I think the true heart of steamos (besides arch and just being great) is what they've done for proton, which all of these alternative distros benefit greatly from and make them feasible. It's like X or Wayland. Proton is just foundational (thank you wine) to gaming on Linux being successful. So even if they don't spend the time to support other handhelds running steamos (yet), they really are with what they've done with proton.
100%