I don't think depending on Android drivers and having to run a small android just to access said hardware makes it a "linux phone". Especially when the linux experience is compromised because of it.
postmarketOS has no hybris and everything works great, but no device has all the drivers (in fact, no device at all is reported as having a fully functioning camera, let alone everything else) so there isn't a "flagship" device.
If I were to overspend on a linux device I want it to actually run Linux, not a handicapped version of it.
And even then, why stop at the OS? Why is this overpriced "linux" phone not boast having user-friendly and sustainable things like a replaceable battery (probably because it doesn't?). People in this niche don't want just a Linux phone, they want a phone that respects them.
That would be a showstopper for now, IMHO. Doing it with maintainable open source Linux drivers is the hard part of having a viable device, from everything I've seen.
Another concern are that I can't find who the developers are, nor even definitively what country they're based in. (I don't see it on their About Us page, ~~and the GitHub repo contributors are hidden.~~ I saw a reference to Sydney, but unclear.) (Edit: my mistake regarding GitHub contributors; they aren't hidden)
Also, it would be nice to have the option of a better hardware provenance than a generic whitebox(?) phone from some unidentified manufacturer in China. Even for individual hobbyist users, and certainly for corporate ones. (This is why I'd like hardware options combinations like Purism for the premium device, and a cheaper device that runs the same software but is still from a brand that at least has a reputation to preserve, like Pine64 or (ha) Google.)
eg: https://github.com/FuriLabs/rootfs-templates/graphs/contribu...