>Nevertheless GOS on Librem 5 or Pinephone would be a nice idea, except the GOS developers are against that: https://news.ycombinator.com/item?id=45101400

GrapheneOS are against using their development resources on a platform that is drastically, significantly worse than the hardware platform they already have, which is quite fair. It is not about Pine64 or Purism's products specifically. They would not be against them if they met 95% of the requirements detailed in https://grapheneos.org/faq#future-devices. It would more sense to explain which of those requirements you think are unreasonable.