Did you use GrapheneOS with the Play Services? Sounds like you didn't. Of course if you don't use the Play Services, you lose... the Play Services. But GrapheneOS allows you to run them in the sandbox.
> Throw in how Google starting with Android 16 is not releasing updated drivers with AOSP and Graphene probably doesn't have much life left in it, either.
This sounds incorrect. Google decided to stop sending the device tree of the Pixel devices in AOSP. And GrapheneOS is still fine, though it will take more effort because they won't get the device tree from Google.