Diversity is indeed very important.
We are the children of diversity
252 million years ago, 96% of all marine species and 70% of all terrestrial vertebrate species became extinct. All those species were adopting the same 'design pattern', mineralized skeletons
It seemed a good design. It turned into a common trigger that wiped out all those species that had made use of it
We are the children of those few species who were 'different', in that they used other patterns
Diversity is resilience.