What do you use for maps? Or paying for parking which maybe isn't the case for you but in my city requires use of a smartphone app. What about music and podcasts? Asking cause I would like to use a dumb phone if possible but it seems like it would actually introduce a lot of friction into daily life.

The Keyphone they are referencing is Android, so those things can be worked around to some degree.

I pay for parking with quarters or a credit card.

If necessary I use a piece of paper for maps.

For music I have an ipod.