There is nothing inherently wrong with a lack of diversity, but it is almost always a symptom of an issue with society or systems limiting people. For example, I would argue that primary school teachers being almost entirely women is indeed an issue with systemic and social sexism.
You have completely missed my point. The point is that everyone should have opportunity if they want to do something and are capable of it, not some kind of homogenization. Women are currently actively pushed away from the industry. If women don't want to be in tech, that's fine, the issue is that women that do get pushed away, discriminated against, or never get the opportunity to learn they are interested in it.
There is no attempt to make everyone the same - the attempt is to try and allow everyone to embrace their own differences - to give everyone the same opportunities.