If a watch is working but its time deviates from the actual correct time by one second, that watch will never, ever show the correct time. It will always be off by that one second.
A broken watch, on the other hand, is guaranteed to show the exact correct time twice every day.
Therefore broken watches are more useful than working watches.
I have a watch that shows the exact correct time two times a day
That more times than any working watch. Consider:
If a watch is working but its time deviates from the actual correct time by one second, that watch will never, ever show the correct time. It will always be off by that one second.
A broken watch, on the other hand, is guaranteed to show the exact correct time twice every day.
Therefore broken watches are more useful than working watches.
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