I have no interest in Android or iOS. I have no interest in phones that make it difficult to run non-android systems on them. I have no interest in devices I have to break into in order to make them do what I want them to do.
Phones that I've been using for more than 10 years now make it easy to run Debian GNU/Linux on them, baremetal, straight out of Debian repositories. Those devices don't require me to run any proprietary binary blob on my system. Those devices are supported by community years after their manufacturers abandoned them, as mainlining makes that task actually manageable. That's the kind of phone I'm interested in and its OS plays a big part in it.
And that is?
I did. Pretty much because all the drivers are mainline(able). Even if purism went belly up today, I could continue to run up to date Linux on my librem 5 basically forever.
They do at least appear to be actively developing those drivers publicly for eventual submission upstream, though: https://source.puri.sm/Librem5/linux-next/activity
[0] https://developer.puri.sm/Librem5/Software_Reference.html