de0u There are a fair number of threads on this forum involving somebody disabling or deleting some GrapheneOS system app and then finding out (sometimes months later) that it was needed for something.
DeletedUser19 Can you link? I tried to search but fount nothing.
https://discuss.grapheneos.org/d/3367-lost-ability-to-deactivate-apps/3
https://discuss.grapheneos.org/d/5752-remove-system-files
https://discuss.grapheneos.org/d/8070-how-to-solve-a-no-keyboard-issue
https://discuss.grapheneos.org/d/8317-can-i-disable-the-default-aosp-apps/7
https://discuss.grapheneos.org/d/8986-unable-to-usb-file-transfer
https://discuss.grapheneos.org/d/9144-failed-to-check-for-updates-trusted-credentials
I believe there are others.