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
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.
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?
Just two examples: removing Google apps from Android devices, installing non-store apps on iOS.
If you run a web search along the lines of "best apps for rooted Android" or "best apps for jailbroken iPhone" you will find many more examples of useful things that you can do with rooted/jailbroken devices.
More info: https://liliputing.com/2019/08/librem-5-smartphone-will-have...
I have a secondary Android device just out of necessity, I am a power user with enough past experience (I was active in Openmoko community, made Debian chroot for Kindle Paperwhite, am still using Nokia N900 etc.) and no - I have no actual interest in Android. Stop-gaps like Debian chroots or layers on top of libhybris won't replace the real baremetal, mainline thing.