I have some strict rules about buying things where I cannot verify the used materials:
Nothing that goes into my body
Nothing that goes on my body
Nothing that touches my food
Nothing my pets touch
Nothing that needs to be plugged in or charged
A smart watch violates multiple of those rules. I wouldn't want to risk it.
I'm very much doubting you can verify everything in your computer/phone as even computer part manufacturers have difficulty tracing their supply chain, so good luck with that.
While I completely appreciate your perspective, I do have to ask: what with how interconnected, not to mention fucked up, the world is today, wouldn't pretty much everything violate at least two or three of those rules?
I took that one to mean You know your Samsung S21 was made by Samsung. That suspiciously cheap "hoverboard" with the lithium ion battery was made... in china... somewhere.