GOS goes in lockstep with what the vendor does: no more device firmware, device dropped.
Lineage and /e/ disregard when firmware support is dropped and continue to build framework updates.
Lineage does only one current major, /e/ does what framework version Google puts out ASBs for still.
That is A13-A15 (and A16, but there’s no /e/ relase for that yet). Exception for A12 store devices, see " A12 - /e/OS S - Support Ending" at Week 36, 2025: Development and Testing Updates