I think Valve’s Pierre-Loup Griffais explained their plans for a Steam Deck 2 pretty well in this interview (starting at 8:36).
Paraphrasing: They are happy to work with other companies, but the people at Valve also have their own ideas and goals for hardware. And they want to be able to set the bar for these ideas themselves. That‘s why they‘re working on a Steam Deck 2.
And when you look at how well that setting the bar worked with the Deck, I‘m really glad that they want to follow up on that.
I own a GPD Win 2, a handheld PC from a few years before the Deck was a thing. That device couldn‘t be charged while using it, it had its speakers wired the wrong way, it constantly overheated and was a pain to use because of that. Ever since the Deck came out, the whole handheld PC market, including GPD, improved their device quality by a country mile.
And that‘s one of the best things about the Deck, in my opinion, and will hopefully also be one of the best things about the Deck 2.
I unfortunately can’t really see how a browser could still be nice to use and properly resist fingerprinting.
The site https://amiunique.org/fingerprint tries to fingerprint your browser and lists the used attributes along with their uniqueness within their dataset. And while a browser could pretty reliably lie about its User Agent or Platform, it’s often just necessary for a modern website to know, for example, what your view-port’s resolution is or what kind of audio/video codecs your device supports. Going through my own results, I’d say combining these necessary data points is probably enough to identify me, even though I’m pretty privacy-conscious.
Maybe I’m overly pessimistic, but I think preventing fingerprinting would need a regulatory instead of a technical solution. Unfortunately that doesn’t seem very likely anytime soon.