I agree. As it stands, there is no immediate problem with buying a vendor unlockable phone for LineageOS or GrapheneOS. It does seem like Google is slowly closing the doors to FOSS, so the future could require an AOSP fork. But it also might not. We don’t really know for sure. As long as LineageOS and GrapheneOS exist and have developers, we have nothing to sorry about.

If, in the future, all hardware manufacturers fail us, I have used Waydroid on an old Thinkpad, and it is fantastic. And, more in the Linux ecosystem is Android Translation Layer which translates Android syscalls into Linux syscalls. It is buggy, but I could see it getting better in the future.

Anyway, I’m not really worried. There are still a lot of paths forward, and FOSS advocates are persistent.