Seems like an easy way to end up picking a lot of people like yourself. After all, it's a lot easier to feel connected to someone like yourself.
> people like yourself
That is certainly a risk with any notion of "culture fit", but any time someone who cares about culture is interviewing someone that fit is being evaluated to some extent.
Suppose you're having a conversation with someone and in 15 minutes one of you chosen at random is going to have to trust the other with his/her life. What kinds of signals indicate that the person is trustworthy, understands the potential future, and is accurately representing him/herself?
There are some people where I never feel the kind of connection I'd want to feel in that scenario, and others where I feel it fairly early on in the interaction. Just a kind of straightforwardness, not extraversion or social comfort.