I've been using GrapheneOS for years (Pixel 3 through 7), with only open source add-on apps and no Google Play Store, and it's been pretty solid. (Other than my carrier seeming to hate the 6a hardware or model specifically.)
It was referring to the overall experience to which I was referring, not the OS specifically ("it's a buggy ride", it = the ride, not GrapheneOS)
I imagine a lot of the issues are because of the apps not testing on GrapheneOS.
But I've had lots of little issues:
- Nova Launcher on a daily basis stopped working when pressing the right button (the 'overview' button). I had to kill the stock Launcher app to fix it, interestingly. Had to revert to the stock launcher
- 1Password frequently doesn't trigger auto-fill in Vivaldi
- Occasionally on boot the SIM unlock doesn't trigger
- Camera crashing often (yes, "could be hardware"...I read the forums/GitHub issues)
More that I can't remember. It's a bit frustrating.
But don't get me wrong, I appreciate the project. I'm not going to go back to stock
Pixels have first class support
You can also disable Network access to any app
(It's a buggy ride though and requires reading a lot of docs and forum posts)