Even so, that does not excuse the rest of the story and hopefully they can improve. A friend of mine also had some frustration with communicating with their customer service (which appeared outsourced or incompetent).
[0]: https://wiki.pine64.org/wiki/PinePhone_Pro#Troubleshooting
They are mainly linux smartphone hackers. If I would buy a device, I would consider it a donation if something goes wrong and not expect something to be able to work with. But that part should probably be made clearer. I also cannot say they are fully to blame, I found their website clear enough that there is no real quality control or support. But if I would have believed certain internet enthusiasts, I would be sad because of broken promises regarding stability. At least basic working functionality by now would have been nice.
Still, things are maybe getting there.
"It's incredible... how much the PinePhone experience improved in the meantime"
If they take your money for a product, then they are professionals for handling consumer cases, they are obliged to be.
They might not want to be, in which case they should hire people who do want to be.
It is not about what you do, it is how you do it, and in particular what expectations you set.
If you sell it like a regular product, without saying clearly up front that it is not supported, then people will legitimately not like you.
IF you are just selling a kit without support, SAY SO. Then the people you want will come buy it, and if you did well on the parts that you claim to do well, you'd have happy customers (modulo the few Kens & Karens who expect everything for nothing).