And that represents a vanishingly small market.

Look at what people do on their phones all day. Most of that makes no sense on a watch screen.

People with little money can't justify the upgrade, people with money don't tend to play silly games and watch TV shows on the go when they have iPads, iMacs and comfort of their home/car/private office.

There is an additional unexplored market where people with much or little money could literally do all things people used to have multiple devices for just with their watch, and handle the rest on their tablet or laptop. The only reason it's not explored is bc Apple wants to sell more devices with screens.

    I am yet to meet a single person with a max-size iPhone

The overwhelming preference is not "the biggest screen possible" but is clearly "the biggest screen you can reasonably fit into a pants pocket."

    Like yoga and meditation and other self-care this is 
    only on an upwards trend

To me a smartwatch is way more intrusive than a smartphone. It's something that's always on my wrist, always on my body. Versus a smartphone which I can mute and leave in my pocket where it doesn't really tempt me.

But, I must stress, I realize this is personal and others might find the opposite to be true. Above all else I am glad that folks are considering what's best for their mental health.

You can mute the phone but you still know you have a (toxic social media) dopamine dose and whole portable office in your pocket. I type this on a phone during breakfast again, if I didn't have a phone I wouldn't be doing it.

Good habits are as much about putting yourself into situations where you are not tempted as they are about willpower