DeletedUser349 if I go buy an unlocked Pixel in a year or so, will graphene still be compatible?
All the Pixel devices that are supported today will keep being supported in the future.
It is unknown what plans Google have for future Pixel devices, such as Pixel 10 and onwards. They might decide to no longer allow flashing custom operating systems, at which point GrapheneOS will not be able to support those. But that does not affect already released devices already supported by GrapheneOS.