Hold your arm so a watch strapped on top of your wrist would be facing toward your eyes for easy viewing of its display.
If you have a smartwatch, or any kind of watch, you do this many times a day.
Now hold your arm in that position for 30 or 60 minutes to watch an entire TV show. You can take a break during the commercials.
Enjoying that? Probably not.
With a [smart]watch, you only glance at it a bit here and there. You don't try to view it continuously.
It is interesting to see a very clever product idea that completely ignores human anatomy.