I have my smartphone and am not the OP, but I spent several years on Windows Mobile which supported almost no apps, so it was kinda like a dumbphone.

I think people often overestimate their need. People act like they can't live without Google Maps, but 90% of them take the same route to work every day. I would argue if you aren't traveling outside your local area, you have zero need for a mapping app. It's true you may not be notified of a slightly faster route because of some unforeseen event, but the difference is probably a couple minutes at most, and you should know your local streets well enough to get along anyways.

There was the rare event where I couldn't participate in some restaurant's rewards program because they only did it via iOS/Android app, and that was annoying, but it also led me to just use that business less.