Are you saying that the Qubes OS security model is worse than the GrapheneOS one?
By the way, personal attacks are against the HN Guidelines.
GrapheneOS is designed so you don’t need root to run apps or manage the device. Compartmentalization is on an per app level. And you already know how qubes does compartmentalisation.
GOS is not running a flavour of mainline Linux, but Android. They're nevertheless planning on moving to virtualisation as well https://discuss.grapheneos.org/d/24154-grapheneoss-roadmap-r...
For now it's as good as it gets.
Do you have any statistics to show about how secure a micro-kernel is? I can't believe it can be better than this: https://www.qubes-os.org/security/qsb/