Why is "diversity" automatically seen as being a "good thing"?

I mean, I can understand why biodiversity is important, but I'm speaking generally here. Would the world really end if everyone were basically the same, or at least similar in all the major attributes (like height, weight, intelligence)?

Update: A few people have mentioned the importance of genetic diversity, and yes, I agree with that, I agree that a case can be made for its importance, but I was thinking more along the lines of diversity in general, as a concept. People seem to just lazily assume it to be a "good thing", and very few seem to question whether, for example (and this is just an example), a diverse workplace is inherently good. Why is that? Why the unquestioning acceptance of an idea that hasn't really even been defined properly?

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Dolimyte · 41-45, M

Diversity in general is not inherently good or bad. Context is required for a value judgment.

An example of bad would be having a diverse selection of screws while assembling an Ikea bookshelf. The screws have a specific function and need to have the correct thread, be the right length and be tightenable with the provided Allen key. A handful of screws from Grandpa's workbench probably won't give you great results.

If we are talking about people, they are incredibly diverse on a wide variety of metrics by default. So keeping that in mind, any kind of organization that lacks a diversity of people runs the risk of missing out on ideas relevant to that part of the population. They also risk becoming exclusionary based on irrelevant factors leading to systemic discrimination.