When you’re making products for a diverse group of people, perhaps having a diverse team is required for competence.
Not only is there no attempt to represent customer demographics on dimensions such as age, but there continues to be rank discrimination against people based on these dimensions, and the people pretending to be in favor of diversity are consistently and conspicuously silent on the matter.
There's a moral argument that comes into play with politics that doesn't for age or race. There's nothing even abstractly morally problematic about making your product appeal to women or old people or whomever. There may be reasons to avoid marketing or aligning your product to, say, people whose political views you disagree with.
My point is that this can't be the real reason for D and I initiatives, since if it was, there would be a similarly strong push to have equal political and age representation in order to reflect the reality of these products' customer demographics.