This. Excluding a country as large, developed and wealthy as the UK due to them leaving in the past is stupid and shortsighted. That said, they fully and willingly lost their initial member advantages by leaving, and should not get special treatment when coming back.
A big problem with Android is ARM vendors don’t upstream anything in so you need to run very specific kernel and bootloaders just to boot the OS. SteamOS on x86 won’t have that problem, regardless of who makes the end device.