I understand your points.
My macro point was that the smartphone introduced several very sticky conveniences, so I kept my smartphone instead of adopting a light phone or similar device. Instead, I am working on treating it as an appliance or a utility device vs. a constant extension of my arm.
For example, my two vehicles can be accessed via a smartphone key/app or a card in my wallet. So my wallet is slimmer than before, but it has a credit card, vehicle access cards, insurance, license, etc. I now carry one credit card instead of multiple physical cards since my phone wallet has several to choose from for tap to pay.
I can unlock my home remotely or via a phone tap, watch tap, physical key, passcode, or remotely. Most phone lighting controls are convenient instead of getting up and going to the switch. But the phone allows for finer-grained control of light temperatures, brightness, electrical usage, etc.
If I was determined to rid my life of a smartphone, I could sell my vehicles, buy a non-smart lock for my home, and stop tracking my workouts and diet with the phone app.
At the moment, ditching my smartphone isn't an option. I'm taking steps to treat it like any other appliance or a utility vs. an entertainment or consumption platform, which is where I believe the addictiveness lies.