I wanted a smart watch to track exercise stuff. Unfortunately, as far as I can tell they all want to download an "app" to the smartphone I don't own, and connect to some remote server for... something.
Both are a hard "no."
I bought an inexpensive smart watch anyway, just to see what functions it would have without internet connectivity. None, as it turned out. It doesn't even do "watch." I guess it gets its time off the phone as well.
A few smart watches have an optional desktop app that runs in Windows or MacOS. I don't own any machines that run either of those, nor would I install skeevy software onto them if I did.
Most people don't care about spewing their personal information to internet randos, but I make a hobby of denying them that.