Office diversity is an interesting topic. You brought up the diversity hires, and I don't support those as well. An employee being hired should rely on their skill, ability to do the work, and how well they mesh with the team; to name a few. In this regard, I have actually seen some teams/companies prioritize how the new employee will be able to integrate with the group over skill. And when you think about it, it could be the opposite of diversity. Diversity is very important when contributing different views and perspectives. Without it, a company can become stagnant and lack innovation.
Let's say that in Finland where there is lots of engineering work, 50% of hires were female. The problem is, less than 20% of engineering students are female, so what would the average quality be of male to female ratio? The percentage at university in STEM isn't about opportunity, it is about interest in choosing subjects.
That is interesting. So it is possible that all female graduates can be hired, while there are a lot of males still looking for a job, regardless of skill. I guess this is one example where diversity hiring is hurting the company.