I don't care for the look of giving technical critique to another project from a platform account. I would encourage the GrapheneOS team to switch to personal accounts for such discussions.
It comes off as entitled - which we need less of in open source. I'm learning to recognize what comes off as entitled, because I often come across this way myself. I'm working on it, so I notice it more in others, today.
It also has a junior developer vibe. I've found junior developers the most prone to comment "how hard could this really be?" from the sidelines of an effort.