Did it fail?
Yes... it did. I have both (details in this post) and I'd love to use either daily yet I don't do it. I also don't know anybody who does.
Was it useful? Absolutely but IMHO the fact that the 2nd version is not fully usable (camera, power usage, etc) without active progress despite being a 4 years old specifically targeting tinkers is not a success. I'm genuinely wondering who would want a PinePhone 2. I'd love to but based on what happened with the Pro, I'm not sure I would despite using my other Pine64 on a daily basis.