Thanks. This matters a lot to me. I focus on it from the angle of not owning a smartphone, but it's even more urgent from your perspective. I want businesses to understand that some number of people, in order to avoid toxic behavior patterns involving social media or doom-scrolling, find a dumbphone to be the healthiest choice for themselves. And yet, the places you cannot park your car, the airlines you cannot fly on, the events you cannot attend... all because you don't have an app.
I do think the personal mental health angle matters a lot, but it adds urgency to consider school, banking, etc being dependent on private company memberships.
My local gym did something wonderful. They retained a keyfob-based access system instead of using an app, specifically because the owner knew "someone's going to have a dumbphone and complain they can't get in."