[shepwalker]

But depending on how stringent your bounding box for "culture fit" is, you end up building an archetype for age, gender, education and ethnicity of your target employee.

The point is is that if you're targeting people who behave like you, have plenty of shared interests and reflect your own way of doing things, those people are going to end up looking a lot like you too.

I think the point that potatolicious is trying to make is that the ambiguity of "cultural fit" ends up becoming a path to hiring people who are very similar to yourself. An alternative approach would be to define explicit, concrete values that your company and team reflect, and look for hires that mirror those values instead of nebulous "cultural" fit.