How would that theoretical OS be better than GrapheneOS? Also, desktop Linux is just crazy insecure, even if there would be any sane hardware available for that

How would that theoretical OS be better than GrapheneOS? Also, desktop Linux is just crazy insecure, even if there would be any sane hardware available for that, that shouldn’t be run on any security conscious device. (And before someone misunderstands me, I do like linux and use it on my machine, but desktop linux is like a house with barely any walls, let alone doors compared to ios or graphene)