I have eOS on the fairphone 5, and I have had zero problems with banking apps and the like.
That doesn’t mean you won’t have problems though, I don’t use many of those kinds of apps other than a bank authentication app, and a few others for public transit tickets, etc. I also live in europe, milage may vary elsewhere.
Keep in mind that eOS IS android, just with google telemetry removed. You can add a google account if you want/need to, at which point any android app should work as expected. That of course defeats the purpose somewhat, but even then eOS will still help you stay as private as possible by informing you about app trackers and using alternative services for location, etc.
Not /e/OS user, but it is Android - just degoogled. Uses microG as a replacement for Google services if I’m not mistaken.
As for apps, I recommend checking out an app called Plexus on Fdroid - it’s an app where people report how apps work on alternative ROMs with either microG or fully degoogled. It’s pretty neat.
/e/ (also known as /e/ OS and /e/OS, formerly Eelo) is a fork of LineageOS, an Android-based mobile operating system,
Fairphone 6
My bank app will install, but I can’t login unless I also install Google Play Services. The website works fine without.
No issues with other apps. I do prioritise installing from F-Droid whenever possible.
Yes, microG is on /e/OS by default. I believe my bank uses some of the security features from Play Services that aren’t in microG.
I’m not 100% sure that it can’t be fixed, but it’s such a minor nuisance that I don’t think it’s worth my time to investigate.