I've been using the Cat S22 as my main device for the past month or so and have found it to be pretty much exactly what I was looking for.

It's a flip phone that runs android, so can still use whatsapp, signal, email, maps, use rideshare apps, scan qr codes, and play music, but is limited enough that I'm not scrolling on it during free interstitial moments. The screen is too small to really be useful for reading the internet or using something like instagram, but I'm not totally cut off from friends and family.

I've used other dumbphones in the past, notably the Punkt MP01 and the Light Phone II and the Cat feels like one I could use indefinitely and not have to have another device handy. The only exception I would note is that I recently got back from traveling to a foreign country and a city I'd never been and I think I would have rather had a smart phone there.