In authoritarian regimes like Russia Federation all grapheneos addreses are banned by any local ips, so without personal vpn or a dpi spoofing on a router, you cant even update a phone/apps in app store also checking internet conection with grapheneos proxy will be always failed, so if something happens with your router or a mitigation techniques will not works anymore you are basically screwed, orbot runs only on a installed profile and dont even work in most cases. So some mirror support implementation or a option to route all traffics on a tor after finding a relay with relay scanner will be a good option.