The words I chose are specifically meant to highlight the downsides.

1. Groupthink has a negative connotation of the downsides baked in.

2. "Hyper" conformity (or hyper anything) is already saying that it is too much.

I think it's well known and appreciated that without diversity of thought and opinion, a group or organization makes possibly locally optimized, but poor decisions.

I know you were, and it’s troubling. You’re ascribing a sinister character to a literally normal phenomenon merely because you disagree with the outcome. And a normal distribution anticipates diversity within the sample: if there were no outliers, the distribution wouldn't look the way it does.

This kind of thinking led to the term “mainstream media” becoming a pejorative term, even though it fairly represented the majority viewpoint. In a well-informed society[1], one should expect the majority opinion to be the one closest to objective truth. (Consider the old “guess the number of jelly beans in the jar” experiment.)

[1] Yes, I am aware that this condition is doing some heavy lifting. :-)