From the Pinephone website,
If you depend on proprietary mainstream mobile messenger applications, banking applications, use loyalty or travel apps, consume DRM media, or play mobile video games on your fruit or Android smartphone, then the PinePhone Pro is likely not for you.
Now I really would LOVE for true Linux based phones like Pinephone to succeed and I will probably buy one at some point but for most average users it isn’t ready for them.
And the last I'd heard, there were issues with the phones doing basic phone things, like making calls. I've noted, in fact, that a lot of privacy minded people keep saying:
Linux phones are promising...but it's just not viable, yet. (Of course, this is one of those "mileage varies" deals.)
But realistically, past this, the inability to run a lot of apps will be a huge limiting factor. There are people, like me, who wouldn't care that much. As I said above, at this point, I have no interest in a phone as more than a secondary device, and I value privacy. But the vast majority of users would care about app limitations if nothing else. Indeed, I'm surprised by the fixation on apps--someone I know needed to do something one time. It could be done by web browser, easily, but she said:
I'll download the app!!!! Really? For a one time use?
Real world app compatibility is also an issue with deGoogled Android phones from what I hear. I remember reading of at least one person who'd used deGoogled phone...but it got so frustrating that it was replaced with an iPhone.