Lack of diversity may be a problem because then you've got a lower chance of getting the right answer somewhere in there. It doesn't mean that everyone is thinking correctly. Do you subscribe to truth relativism? Otherwise, what could be thought about that doesn't have a correct answer?
If everyone is thinking in the same way, you have a good result only if that one way is the correct way. If there are a variety of different ways, all of which appear good, they will produce varying proposals which can be considered for their direct practical consequences, and when the different methods come into conflict, all can be tested and potentially improved.
You might object that you have deduced the correct way of thinking, and therefore you do not need to be concerned with this. Two counter-arguments: 1) You are most likely overconfident, and the ...
Another month, another rationality quotes thread. The rules are: