Do you wear a watch?

[True Federalist (진정한 연방 주의자)]

You wear it on your non-dominant hand/wrist, and I was under the assumption this was common knowledge.

That's just... weird though.  Why does this 'rule' even exist in the first place?

Well, the wrist watch began not as a fashion statement, but as a practical way of carrying a watch to use while doing other tasks with the dominant hand.  In that case, the best place to put a wrist watch is on the opposite hand.

[True Federalist (진정한 연방 주의자)]

You wear it on your non-dominant hand/wrist, and I was under the assumption this was common knowledge.

That's just... weird though.  Why does this 'rule' even exist in the first place?

Well, the wrist watch began not as a fashion statement, but as a practical way of carrying a watch to use while doing other tasks with the dominant hand.  In that case, the best place to put a wrist watch is on the opposite hand.

But as soon as watches were designed to wrap around the wrist rather than be held in the hand, that rule ought to have died.

You seriously intend to try reading a watch while it's on the wrist of a hand that is doing something else?

[True Federalist (진정한 연방 주의자)]

I've survived the last 20 years or so doing so without any issue...

Then you either have very good eyesight or were doing tasks where you didn't have to keep your dominant hand engaged while you consulted your watch for the time.