You should be looking because diversity of experience and opinion helps you build a more well-rounded product that your users can empathize with. Alternative and comprehensive perspectives will only help your group thrive and expand their reach as well as build a sense of community and culture on your teams.
Users may not consciously "empathize" with products, but they will be discouraged from using them when their experience using them is sub-optimal.
When I use HN I don't wonder if the person that added the "reply" button is black or not... I don't really understand this. (I am black)
AFAIK, there is precious little actual research pointing either way. No doubt it's an extremely nebulous subject to study. Groupthink is certainly a thing, but I haven't seen strong evidence linking diversity hiring to the particular outcomes it is claims to treat.
Why do you need different skin colour or a vagina to have an alternative perspective? Do I think the same as all other white guys? Or do my blue eyes give me some unique insight that brown eyes (which are uncommon in this country) don't?
Here's the paragraph I want to highlight:
"Members of a homogeneous group rest somewhat assured that they will agree with one another; that they will understand one another's perspectives and beliefs; that they will be able to easily come to a consensus. But when members of a group notice that they are socially different from one another, they change their expectations. They anticipate differences of opinion and perspective. They assume they will need to work harder to come to a consensus. This logic helps to explain both the upside and the downside of social diversity: people work harder in diverse environments both cognitively and socially. They might not like it, but the hard work can lead to better outcomes."