If you've worked with other people you know personal attitudes about everything get interjected into business.

It's part of being human. But when personal preference leads to excluding people who are different than you, even if that might improve the overall product, getting those different people together to break down barriers is helpful. That is what DEI does.

Your comment is a bit like saying if being educated allows people to be more successful everybody would be educated. And yet, they aren't.