GrapheneOS has to do substantial work on each supported device to integrate the hardening features and fix the issues those uncover. Supporting other devices is

GrapheneOS has to do substantial work on each supported device to integrate the hardening features and fix the issues those uncover. Supporting other devices is not easy and involves a lot of resources. Those devices also need to provide the hardware-based features heavily used by GrapheneOS including hardware memory tagging, pointer authentication, verified boot, etc. which those devices don't provide.