As someone who owns a PinePhone I can tell you that a lot more work needs to be done first. postmarketOS is ok but being Alpine based means you have to forever deal with all the issues that come with it including its primitive package manager. And mobian also kept breaking ever other half a year or so requiring manual config changes etc.
What we need IMO, is a more reliable spin like Fedora, maybe even something immutable like Silverblue to ensure the stability required for a daily driver device while also being quick to deploy the latest versions of releases.
There’s also the whole app ecosystem aspect but between advances in Waydroid and convergent GTK apps, I’m more concerned about the underlying base OS than the app ecosystem ^^