It can be rooted just fine without doing your own build. It's just that if you do, the GrapheneOS community will claim that it is no longer GrapheneOS and that it's separate.

Replacing a large portion of the core operating system code and SELinux policies with a third party project is making a derivative of the OS. It can no longer receive standard updates anymore and won't pass verified boot without resigning it. A derivative of GrapheneOS with significantly different code, SELinux policies and distinct signing keys is not GrapheneOS. Verified boot will no longer work as intended anymore even after resigning and the same applies to a large portion of the security model in the OS. Giving root to a huge portion of the OS greatly reduces security even if it's never granted to any apps.

That's the bizarre thing about this hn discussion... A lot of people referencing rooted phones, but to the best of my knowledge GrapheneOS is almost never rooted?

There's only root if people make a userdebug build with user-accessible root or make a derivative of GrapheneOS with major modifications. The production builds don't have uncontained root since it would greatly roll back the security model. Only a few core processes run as a limited subset of root.

There's only root if people make a userdebug build with user-accessible root or make a derivative of GrapheneOS with major modifications. The production builds don't have uncontained root since it would greatly roll back the security model. Only a few core processes run as a limited subset of root.