Neither of those are dumbphones and neither resolve 90% of the problems I mentioned. I wasn't trying to get away from walled gardens or chase additional privacy, I was trying to get away from the most distracting devices ever created and to intentionally not have 24/7 access to a web browser.

My path was iOS -> LightPhone 3 -> GrapheneOS -> iOS.

The LightPhone was the right level of capability for the distraction free goal I had but it wasn't capable enough to resolve all of the things I mentioned.

The phone with GrapheneOS was an attempt at compromise. The idea was something I had enough control over that I could (in code) limit my usage on. In reality it didn't limit my usage and had issues with things like banking apps and RCS, so I was basically using a more irritating iPhone again. I went back to iOS.