I love my Pinephone. It is undoubtedly my own, with no strings or trillion-dollar corporation helping steer. It's lots of fun to play with, but unless people already half-jokingly compare you to RMS due to your extremism, it's not ready.
Android circa 2009 would be a reasonable comparison: the potential is clear, the software is rapidly evolving, and there's a benevolent dictator at the helm. And that's enough for me to be happy with it :)
The basics are pretty much down. Kernel support is solid. It can make calls, send texts (MMS mileage may vary), and use data pretty reliably. Web browsing is actually pretty fast with Angelfish. You technically have access to the full repository of Linux ARM software, and some of it even resizes properly to the phone. The camera is usable but terrible. Anbox works for Android apps but is painfully slow and can't share data with the rest of the phone to my knowledge.
Battery life is terrible, I don't think that the phone has power states of any kind, so it's either with the screen on, on with the screen off, or off altogether. Updates frequently break my install, although updating through SSH has been working for me recently on Tumbleweed without breaking anything. Little things like Plasma not having a way to exit the keyboard, apps taking up full screen with no way to exit them, etc.
Performance is painfully slow, but has also improved (for KDE anyways) by leaps and bounds. It used to be completely unusable but now it's merely very slow.
I would say it's somewhere between for developers, and usable, at this point. You could use it with some sacrifices, and still have a functional wireless communication device. It absolutely is nowhere near replacing my OnePlus running Android, however.
Sure, not quite as handy — or Handy, for the German-speakers among us — as a physical phone... But, say you keep your laptop with you in a backpack (Rucksack ;-) ) or such, and a Bluetooth hands-free headset clipped to your ear...? I hear lots of youngsters listen to music continually nowadays, so they already have some kind of earbuds in all the time anyway. Or maybe even some kind of Bluetooth "satellite" handset, to make it easier to initiate outgoing calls / read and write text messages?
Money: Pine64 is a small operation with limited resources, factories have minimum order quantities among other commitments.
Most Pine64 products have pre-alpha software and are aimed at volunteers who can improve it. Lots of people are willing to buy a product for <$150 and "see how it goes". $400 filters out a lot of people who might otherwise chip-away at software bugs on weekends. Additionally, people are less tolerant of dead pixels on a $400 laptop, and Pine64 would rather not deal with returns.
They took all the trees, and put 'em in a tree GNUseum..
Didn't go that route though because of the unavailability of the supported models where I'm at
Canonical supported versions were based on snaps-predating app framework (click packages). There were a couple of phones released with it out of the factory (bq aquarius 4.5 and meizu mx4) and a bq tablet, but rest of the supported phones use android kernels for hw enablement.
Ubutouch has forked the software when Canonical pulled out and even runs an app store, but I think the best hw you can get is Oneplus 6t and then mx4.
I used mx4 as my daily driver for years prior to switching to Android for the first time 3 years ago. While not the fastest phone, mx4 was usable (things I hated most were sharp edges and how it would register touches in my pocket, and then get locked for 10 mins because of wrong passcode).
To be honest, I quite prefer the Ubuntu Touch over Android (and Nokia Meego/Maemo is up there too, but Palm Pre WebOS takes the cake as the best basic phone UX I've experienced).
I think Mobian has the biggest potential to be the pure GNU/Linux system in your pocket, so I am hoping it'd get Unity included too.
First time I've heard of Mobian, looks really interesting. Will keep an eye on it
Most advice I've gotten has been flash a custom Android kernel or a de-Googled distro. This would definitely solve my problems, but this removes the ability to install Play Store apps which are a necessity for me. Not to mention that it gives the possibility of bricking my phone, which is way outside my risk tolerance for just getting rid of some annoying ads.
In case you do want to install a custom Android distribution (ROM) to clean out the Samsung bloat more thoroughly, the risk of hard-bricking your phone is almost non-existent nowadays. The worst that can happen is usually a soft-brick which can be fixed by reinstalling the original OS. As for Play Store, most custom ROMs either include or support installing Google services and Play Store with full functionality.
(disclaimer: I work on custom kernels and ROMs)
It also makes me pretty pessimistic when it comes to privacy. I can uninstall Windows/MacOS on my laptop, coreboot it, use FOSS/privacy-centric software, etc. but it doesn't really mean much when my phone (which is basically attached to my body 24 hours a day, and is my main conduit of communication with others) is a privacy/security nightmare.