I would recommend a pattern of testing for you. When you reach for your phone to do something figure out how you would do that on your postmarketOS device. For example, if you go to your phone to check the weather take that opportunity to get weather working on your postmarketOS device. Do that over the next few days and you will find something that is harder and needs some help to get going. That's a good thing to bring back to here. For example, can you access your bank from your postmarketOS device? What about maps?
The cool thing is if you switch those things that work over to the postmarketOS device as your default you will start picking it up first and trying to do the thing without really considering it, only to go back to your other device when it fails.
I would love to hear your results after you have tried this for a few days or a week. What works, what doesn't, and what took the most work to get sorted. Those are all useful things for other people considering using it, and useful for developers too.