[commoner]

GP seems to be describing a flavor of Android that does not have microG or Google Play Services.

CalyxOS has microG, and I have no problems getting timely notifications on Signal or Slack, nor do I have any issues using Lyft, Google Maps, Google Photos, or any of my banking apps on CalyxOS (or LineageOS for microG). The only exception on your list is Google Pay, which I don't use because it is extremely privacy-invasive (gives Google all of your transaction data). In my opinion, CalyxOS is a very practical OS that balances convenience with privacy.