Thank you for saying this. Yes, its getting way harder and its not easy finding an older phone to install these ROMs. Even with what's going on with how Google is reacting with Graphene OS. They are slowly locking y'all out of the Pixels, and AOSP dropped support of the Pixels with Android 16.
(This is one example) The latest update to the Pixel 10 camera is locking out Graphene OS users cause it needs Play Services in order to work