Electric shifting has pretty much 0 maintenance these days, there are no adjustments on the electric derailleurs that bolt on to the frame. Charging it once a month is mildly annoying though and I wish they put bigger density batteries in.

Mine had the error and it started working after deleting cache/storage, uninstall and doing a clean reinstall.

I was in the same situation, but I slowly started to get rid of android/ios only services. Now my new bank offers every service on their web page + it has very convenient REST API where I can monitor my account.