I guess this could be similar to GCam Photos Preview needing to have the Google Photos package name?
There are probably shortcuts, like double press power, or some hardware capabilities that are only available to specific apps, so GCam has to fake the package name on those devices
On the FP4 we just get the added benefit of having multiple installed
Package names are usually needed to access all cameras and/or to enable features like Google Lens.
Some brands (eg: OnePlus, Samsung, etc) restrict access to all cameras. They have a “whitelist” of apps (package names) that can access those cameras, so modders release their versions with package names that are on those lists.
So seems to be to be a practice to make it harder to use all cameras (so not only an FP4 issue - even though I would not expect this from Fairphone, but the module itself - the camera hardware - is probably also some specific chip etc. and so it might not be Fairphone’s “fault” only).
From how I read this thread, there was a question if astrophotography worked with Gcam on the FP4. I don’t think it works as it should. And I posted an example to demonstrate it.