Unfortunately we don’t have Express Transit where I live but we do have a mobile app that you show to the driver on the bus or the fare inspector on the train.Most of the stuff I do every day don’t require cash anymore, my city also has Apple Pay Express Transit so even the travel card is on the Apple Watch, together with my credit cards etc.
But I still need to carry a wallet due to the ID card / driving licence, my work ID, petty cash in case some smaller shops that don’t have or deliberately don’t install credit card machines (to evade tax, you know). So it’s kind of worst of both worlds. I don’t have much use of the wallet but I nevertheless have to carry it.
supposedly an Apple Pay bus card is coming soon from Valley Metro., similar to the LA, SF, and Portland implementations we saw recently.
Only place I can think of that is cash only here in Phoenix is Pete’s Fish and Chips, and it isn’t good anyway so I don’t bother with that place. Even the Mexican food guy run out of a gas station parking lot tent here has Apple Pay.
As for drivers license, check with your state government. As I stated above mine has an app for that.