In beta testing, you isolate bugs by developing sufficient data points to see trends and isolate causes. It is by seeing duplicate bugs that you can see that a seemingly random bug is not random.I don't know how useful it is to report duplicate bugs.
For instance, right now we all need to be reporting every Phantom Braking error. I am seeing it every time I drive to work at exactly the same places. For me, these seem to be the same shadows every morning and same repaired potholes at night.
One person reporting one bug once may be almost impossible to isolate. And probably should be a lower priority unless a critical.
Duplicate bug reports about the same bug in similar situations may make the causes more clear.