(I agree with you in spirit, namely that GrapheneOS' standards are clearly beyond what most vendors are willing or able to do and a compromise or support of users who want to port the OS might be fitting for the current situation, but notice that the person you replied to never said "minimal", they said "minimum". I'm not a native english speaker but I believe your reading is a value judgement along the lines of "not much work" (in this context) whereas they probably intended it like a statement of fact regarding what the requirements are.)