This "uniquely individual, but authentic and consistent persona" factor is a great trend for public persons. The reason why it works is because even if you don't agree with or like the host, say Lex or Joe, they are authentic and consistent enough that you can 'subtract' the difference between your average opinion and theirs from a conversation with a guest and still get back a reasonable read on the guest from your perspective.

It's like they're a human guage block, constantly measuring their guests with their own personality and reporting the relative measure. Then you slap your Rogan-to-infogulch guage block on top and now it's like you're measuring their guests yourself by proxy. (I'm tired but this seems like a reasonable analogy.)