Yeah everything works except payment, and banking apps, and probably some other stuff. Considering Google's policy direction this isn't going to improve sadly

My banking app works without any issues, but I do have google play enabled.

You can't use Google Pay obviously if the phone is de-Googled. That's a good thing IMO, the last thing I want is Google tracking how I spend my money. Carrying a credit card in a wallet case with my phone is a very minor inconvenience.

The Bank of America app runs on Graphene without issues however. So generally speaking it is not true that banking apps don't run on de-Googled phones. Here it is the developers that are to blame if they enforce compliance with Google's requirements and don't stick to the basic FOSS version of the OS.