Good article. I have generally really benefited from jumping on the smartwatch bandwagon about 3 years ago (GW4 to GW7). It provides accountability that does get me to change my behavior - whether its getting in steps, workout time, or getting to sleep on time. But there is a corresponding learning on when to ultimately trust yourself and how your body feels over the data.
Rest days are an obvious example which Samsung at least doesn't support (I think they are in WatchOS now). Instead I get a nice guilt message the next morning which just causes me to laugh now.
Also agree on sleeping with a watch. I deal with it for the sleep data and generally it isn't a huge deal but it makes me wish Samsung or someone else would build a super stripped down ring that only did sleep tracking. Maybe it would still need as many sensors so no cheaper. But no way I can justify the extra cost just to wear the ring to sleep the way things stand.