While I genuinely disagree with boiling down the value of diversity in purely economic terms- diversity IS a strength in workplace situations.
There are decades of research on this topic,
finding benefits like:
Cloverpop
did a huge research project on decision making and diversity in teams and found, among other things that:
People who question the value of diversity in the workplace likely don't work for truly global companies. If you do- you fundamentally understand why diversity is so important.
Diversity is also important in government- as it makes it easier to draft and pass legislation that incorporates the diverse set of needs from our diverse electorate.
And, finally. no one wants their kids to grow up as a bunch of old, bitter, sexist, racist, and homophobic jerkoffs who post ridiculous threads like "What does diversity is our strength mean?". Having more diversity around us makes our kids a lot less likely to grow up that way- and much more able to handle the realities of an incredibly diverse world instead of cowering in their homes watching Tucker Carlson and fretting over white birth rates.