You are the right person at the right time for me! 🙏I'm looking the same but nervous to make the jump. Playstore apps that I cannot get away from are below. If you have chance to try or experiment, I would be very grateful.
Qobuz for my music
Banking apps
Car EV charging apps
Uber & Bolt for taxi when I'm in different countries / cities
RethinkDNS and firewall app to close down leaks and block ads
I've installed and used every app requested (at least the ones that let me use the app without account, althought i tried the 'use Google to sign in' in Qobuz, which worked perfectly fine!).
Since i don't have any experience with any Car EV apps, i just installed the ones from Volvo, Tesla and FastNed (for charging points around the erea). I don't have an account for Tesla and Volvo, but they installed and booted without issues.
And so did every other app and service! And the apps that didn't require an account, ran just like any other Android phone i've ever used.
Murena's App Lounge heavily relies on Google Play Services API, as well as the ones needed for F-Droid, etc. I suggest reading through this link to understand a bit better why everything should (and does, so far) work;
Additional, if you need the apps from Google Playstore that you've paid for, simply log into your Google account when you first set up App Lounge. The App Lounge is also usable without an account, for this just sign in as "Guest".
If you still use Google for Agenda, Contacts, etc, this will all work on Murena's apps too!