There are reasons to remain on Google Android for now, though. For example, QuickShare compatibility with AirDrop[1,2], or compatibility with certain banking apps[3].

[1] https://www.android.com/quick-share/with-iphone/

[2] https://github.com/GrapheneOS/os-issue-tracker/issues/6550

[3] https://grapheneos.org/usage#banking-apps