Although women do make about half of the population they do not make for half of the applicants in tech fields, in reality, a lot of women don't even get to the stage of studying STEM careers.

There's some interesting studies when it comes to girls own perceived perceptions on how well they will do in math. With girls perceiving they will not do as well in math subjects as their male peers (even though in assessments they're pretty much equal). This perception often comes from home and it's a significant factor in why girls don't eventually become STEM women.

I think there's probably similar factors at play when it comes to different ethnicities and putting an effort into changing these perspectives has led to some of these DEI measures.

Not to mention the fact that a degree of diversity is an asset when it comes to decision making, as groups with too similar backgrounds tend to fall into conventional thinking (the version of it that's applicable to their respective fields). So some diversity in teams leads to more dynamics dialogue between people which is key for creative problem solving.

I'm not sure, given that a lot of the data available seems to be poorly constructed, that DEI efforts have been too much. Certainly there's a conservative backlash but that doesn't really tell us if these DEI measures have been effective or not at achieving their objectives. Fundamentally, I think there are some people out there who don't really value diversity so they're against the objectives sought by DEI measures to begin with and these voices seem to quite loud lately. I don't think these are the kind of people who would change their minds if shown data and research anyway.