The SteamDeck isn't for me (don't care for mobile form factor). But this work also benefits me on a Chromebook using its experimental Steam support. It runs Steam and games in a container that works well with Proton.
I'd tried gaming on linux before and gave up after a week or two of configuration attempts. I had put it off for ages and tried with proton on a dual boot system earlier this year, and instantly had access to everything installed on windows. It also means I can actually recommend linux to people with older machines trying to squeeze a little extra out of their lifespan, without having to tell them it's an uphill battle to get gaming working as expected.