Of course, everyone has different requirements on their phone, so the question if one would be comfortable running their buisness of a pine phone is quite divers.

Phone calls, texts and E-Mails

Text and E-Mails pretty much work as well as on every other phone. Phone calls work too, but the audio quality is below what one could expect from a modern iPhone.

Battery

While the battery runtime of one battery is definitely lower compared to competing devices, it is also replaceable. I usually spend my day in the office were the phone can be charged, so the battery life does not become an issue. When I am traveling I bring some extra batteries. The form factor is commonly available and batteries cost around 10 €, so I got 4 of them, which last me for ~36 hours until I have to charge them. I have so far never spend more time away from an outlet.

GPS

Works nowadays pretty reliable, accuracy of around 20 m is also good enough to find were I need to go

Bluetooth

Definitely not perfect but random disconnects happen rarely. On the other side I have an headphone jack, which always works reliably

Camera

Ok, this point goes to you, the camera is not usable. When taking pictures of documents I usually have to use my tablet.

So now to the overarching question:

Do you, in all honesty, feel comfortable enough with your device that you would confidently run a business solely through it? No, I would not feel comfortable to run a business through a phone, I need a real computer for my work. If I could only use a phone I would choose the pine phone, because at least it can run all software I require for my daily work. Connected to keyboard, mouse and a monitor it could be a slow, but acceptable work machine I can certainly imagine that there are jobs, which rely more heavily on a phone. But in these cases one should have separate work and private phones anyway

I couldn't run a business on any phone, frankly. That's what computers are for.

Also the GPS worked fine for me.

Let me guess, Manjaro or another unstable distro is where things broke for you? Mobian did not break things on update, much like Debian on desktop. I know the person you replied to uses Manjaro, but if you want a stable experience you really shouldn't.

And most people aren't running a business, so there's that.

I don't deny that the user experience isn't great, it is development/early adopter hardware, but it's definitely usable as a daily driver.

Missing a phone call or text is unacceptable and id consider that a fail if it came to phones everything else you mentioned wouldnt be a fail just poor quality in my opinion

That's what separate work phones are for :/