Good. Some of us don't use smartphones. 10% of US adults don't according to a 2023 Pew survey, though I suspect most of those are old people. Any business requiring one explicitly excludes me as a customer and generally makes the world a less-accessible place.
The smartphone-required world is a dystopia. Build on open protocols so people can write whatever software they want on top of them. UI should be personal preference, not dictated. I prefer to control my life from Emacs, but wouldn't dream of forcing everyone else to. Please return the courtesy.