I understand the situation fine. Having seen countless stories of unsuccessful surgeries, I've never heard of the grafts growing for two years then stopping.
A much clearer cut situation would be if the grafts didn't grow at all, or shock loss of the surrounding native hair.
I imagine it must also be very frustrating and sorry you're experiencing this, but there's no official playbook. Unfortunately with no direct proof of surgical error, it is ultimately up to the surgeons. discretion. By all means you could suggest these solutions to them, but there's no guarantees they'd feel obligated.