If you use Linux like MacOS and only run static binaries and containerized programs via things like flatpak everything is fine.
It's totally possible to treat the distro simply as a thin base layer and get everything else from flatpak and the various container hubs. It does work great.
They're entirely welcome to do this, I just think there's room for more opportunity with combined/open effort. Idealistic? Sure.
I'd be remiss if I didn't mention that doing nothing remains an option.
To be clear: I'm for a first party solution. I support their efforts as much as I can. It will have considerable impact on the users. Both ways.
And what of it? Every time a for profit company uses open source they'll either create a closed fork, and if they can't they'll create closed source modules for it.
I'm not saying it's bad to wish for companies to support FOSS, I'm just saying it's an unrealistic expectation to have.
There's definitely a desire for an appliance/console like experience where all the complexity is hidden behind install/play buttons, and steam has got most of the way there. As protondb shows that can't go all the way and tweaking is needed owing to the shifting PC compatibility in general and running software from one OS on a different one, it's the nature of the beast. Personally pushing towards monoculture on an open platform needs to be tempered, and there's a lot of debate previously for other places where that's relevant.
I think there are several segments that want one true way (their way).
The arguments are tired, the word serves us well. They insist, yes, and forever remain hopeful that This Might Be the Year. Meanwhile, the reality exists for plenty already.
Supporting Heroic would appear on-brand given their old game/archival messaging, but I'm not learning marketing for free.
Not really against a first-party option, even. I do, however, find the inevitable user split notable.