It's my work phone and it's newer and faster than my personal phone (both cpu and display refresh rate), there's only essential apps installed, every week it (grapheneos) notifies me of various updates, the screen and shell look pristine... Everything is literally good as the day it was bought but my work will say we need to have a new device be produced now :/
Pixel 10 pro and 10a seem to be available for decent prices. Those are the newest GrapheneOS supports (Pixel 11 is not supported due to Google not supplying them with the MTE security feature), so one of those is a likely successor. At least these will be supported until August 2032 (10 pro) and February 2023 (10a).
Motorola's new phone is interesting too, but probably won't offer me much over the Pixel 10 pro.