I don't know, fellow jananon. I feel like in some boards there are multiple types of the same threads being made all the time. If this was allowed to occur, half the threads or more of a particular board could become nearly identical. This bumps good threads off and lowers the overall diversity and enjoyment of the board for its users.

In one particular board I janitor, we even got a BR instituted for "duplicate thread" to address the serious issue of multiple threads on the same topic.

I think your concern is potentially a board-specific one, and it may be a good idea if you see it as a problem to bring it up to the higher-ups, but in the meantime, I wouldn't count on others changing the way they do their job.