> not because of privacy concerns which I guarantee you 99% of Steam Deck users don't give a shit about, they just want to play their games.

I actually agree with everything you said except the above. Valve (and their employees) do actually care about privacy concerns, regardless whether their users do or not. I agree that's not the primary reason they did it (it was because of Windows control as you said), but it isn't a non-zero factor.