It should be noted that GrapheneOS had similar criticisms about almost every smartphone vendor, including Motorola before their upcoming cooperation IIRC.

Most of their criticisms are valid, but they seem to be absolutely unwilling to make any compromise at all.

Not sure if they want to protect their brand, if any of those criticised issues would increase the work needed by them significantly, or why they are like that.

But I would prefer to have a slightly less secure GrapheneOS on many phones, that helps many many more users than just Pixel owners, over the current all or nothing situation.