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.
It’s gotten so seamless now, and wine has gotten pretty good. I can download a Windows executable, double click it, go through the regular Windows installer, and then have it make a shortcut on my desktop which will launch it.
Your average user won’t even know all the Dark Magics making it possible, or that they were supposed to have looked around for a Linux alternative, it just works