In addition to what Neonred wrote: Steam Deck uses Wayland by default and its Steam is configured to run just fine on Wayland, even if it’s possibly using XWayland behind the scenes.
both are still not native and need the XWayland compatibility layer, which is usually (but might be turned off) compiled into your Wayland desktop manager
Wayland breaks VMware and steam for me. Am I stupid?
In addition to what Neonred wrote: Steam Deck uses Wayland by default and its Steam is configured to run just fine on Wayland, even if it’s possibly using XWayland behind the scenes.
both are still not native and need the XWayland compatibility layer, which is usually (but might be turned off) compiled into your Wayland desktop manager