Do you get many apps that complain about not having Google Play Services installed? Just had one (not Magic Earth). Seems to work fine after I hit "OK" to dismiss its message. I'm assuming it only requires it for auto installing updates.
Google Play Services implements a lot of increasingly vital features and interfaces on Android. Not having it kills a good number of things people consider important, like push notifications (some apps are designed to still send push notifications like Signal, but it's kind of a hack and does drain the battery). If you're looking for almost the same functionality without google play services, MicroG[1] is an open source implementation of Google Play Services and its' associated components. I don't think it works on GrapheneOS unfortunately, but GrapheneOS already sandboxes all the Google Play Services components, so you should be fine as is. "Normal"/stock Android roms aren't set up the same way however, so you pretty much need either Google Play Services or MicroG for push notifications, location services, etc.
Do you get many apps that complain about not having Google Play Services installed? Just had one (not Magic Earth). Seems to work fine after I hit "OK" to dismiss its message. I'm assuming it only requires it for auto installing updates.