I think GrapheneOS is still quite far from a convenient experience. Mostly because it confuses permission requests with privacy concerns. Permissions on Android don't necessarily affect the user's privacy. Focusing too much on Android Permissions takes time away from true privacy issues, like always-on tracking.
Discussion
This gets into subjective territory. It depends on what someone considers convenient. I found stock Android far less convenient because so much shit got in my way that I didn't want.
Can things be improved? Probably. But if we just make it the exact same as the alternatives, are we left with an alternative?
Something has to be inconvenient to someone.
As for permissions, I've always had mixed feelings about them, but if they're there, shouldn't users be paying attention to them?
How does an application tracking location, accessing mic or audio not a privacy issue?