I worked retail and manufacturing after I got married.. It is not an unsafe conclusion.
Not sure what relevance that has or how that 2 statements are linked. Was its selling complicated high technology and a job in software Engineering or high Tech manufacture? Maybe you did.
Regardless I still can't see how you can can say with authority that ALL devices (specifically the Galaxy Watch) WILL have an issue at some point.
(a Best Buy Employee told me the return percentage was large).
Anecdotal and unsupported by actual figures and no apparent detail in why watches were being returned.
So I question it's relevance as support the statement to ALL watches will either start out faulty or develop an issue.
To put that into context All devices of this nature have "issues" or bugs. That's kind of how software works ( or indeed doesn't).
I am personally convinced that the activity reminder is broken. Possible by the last update. This will not cause me to return the watch or call it junk. I am fairly confident a patch will be issued at sometime if there is an actual issue.
Similarly if the step tacker function has an issue ( very possibly even though mine seems fine) Samsung should acknowledge it ( unlikely). It is far more likely they will issue a fix as a patch and call it a performance enhancement. That's how software companies work.
However, some very good points in the rest of your post about the level of expectations and actual usage being crucial to how a user perceives the performance of their watch.
For instance I have absolutely no idea if sleep tracking works . For me, the watch is too big to wear in bed. My previous (much smaller) Fit Bit gave me nearly 2 years worth of sleep data.
I was unsure then and and remain slightly baffled now as to what I was supposed to do with that information.