to some people a watch is a fashion item, i acknowledge that to them my opinion is 100% invalid
I see a watch as a tool.
aside from the date and time that any watch should provide reminders, the current temperature/weather, media controls for my phone, something to let me know my phone is blowing up when i've got it muted or it isn't in my pocket, and maybe a calculator is really about all a smart watch should do.
open and extensible enough to be able to roll your own tools or maybe hack together something like a remote garage door opener or a remote for a tv or pc would be nice, or a data logger of some sort (steps,temperature, location, barametric pressure, altitude,etc) but there are probably items that could get the same job done, just as easily, possibly better.
Heart rate/glucose monitoring may be helpful for some people with medical issues or an interest in their personal fitness/health, gps could be handy for hikers or certain careers..
but to be honest, the vast majority most of the features of "smartwatches" are solutions looking for a problem and manufacturers have proven over and over they have no clue. a watch that has to be charged daily is almost pointless. a bright multicolor screen and enough processing power to play hd video on a 1-3" inch screen is pointless and a waste of battery.
advertisers, marketplaces, etc are a bit too much. you probably could get a few accidental ad clicks on a scientific calculator but if you need money that bad you're doing something wrong or trying to save up to be able to move planets with a spoon.
"smart watch" utility/design peaked somewhere between the pebble and the amazfit bip.