How is getting out of your car, walking to a valet or booth to talk to a person, and paying where they ask "What is your stall number?" less complicated than literally just plugging in your car?
To be clear, if you have a Tesla, there is NO app needed. There's nothing. You literally just plug in and it works. That's better than any gas station I've ever been to.
FYI - This isn't a Tesla EV thing. This is an EV thing. EVERY network basically requires either an RFID card or a smart phone app: ElectrifyAmerica, Chargepoint, SOMA, Flo, EVGo. I can't think of one that doesn't.