Source is this video:
Windows Was The Problem All Along - Dave2D
We could obviously compare performance between windows and steamOS before on the steam deck, or between windows and Bazzite on other handhelds. But this is the first time we have had official windows and SteamOS builds for the same hardware.
Agreed. Proton is important as a bit of an “iPhone moment” where all this tech comes together in a way where non-techies “get it” in the sense where they understand why it’s useful, even if they’ll never bother to learn the details of why or how.