So then what's the point of having a Play Store without Google Play services?
Signal brings its own notifications, so they work perfectly.
The only app which was broken to the point of unusability was Too Good To Go, which demands that you pick locations on a map which relies on Play Services; the manual city entry is broken.
I use Google Maps only in Firefox Focus, but I've heard that builds of Google Maps up to about a year or so ago didn't rely on Play Services, and with Aurora Store you can manually enter a build number to install.
tl;dr: 10/10, fabulous experience.
Install Droidify, enable the repos, and install "microG Services" and "microG Companion".
I am personally more than okay with using the official, proprietary GP services from time to time if they abide by the same rules, especially that I can make these rules as strict as I want.
After opening the application, it complains about being installed through an "insecure method", and bails. Reinstalling through Google Play magically fixes that.
These "security checks" are spreading like measles, so expect to see this sooner or later.
That's because apps that aren't published just on the Play Store but also on other stores or for direct sideloads (for users running Huawei for example which doesn't have Play Store) need to be able to detect the installation method to do updates on their own if there is no backing store.
It's the responsible thing to do. Apple has done it a few times.
And even if you install Google play on your graphene phone, it is still more isolated by default. Add that to the concept of storage scopes and more permissions control (apps have to ask for access to the network) and you have a more secure platform.
No thanks; I choose to forego Too Good To Go instead of that. They are the only truly broken app I have found.