I’ve only heard of GrapheneOS (and that authy is insecure in the same breath, so I need better 2fa apps).
The biggest thing I can think of that I don’t want to lose is the Motorola gestures. I constantly chop to open my flashlight and twist to open my camera.
Besides that, I have never touched the rom before, and I have both wells Fargo and discover banking apps I use semi-regularly. The banking apps I could probably move to just doing their actions on the website, but that difficulty is something I would like to be aware of going in.
I also use Mihon (successor to Tachiyomi) so problems with that and solutions would be nice.
I can at least tell you that Mihon will work just fine, it’s a FOSS app but sadly not available on F-Droid