It depends on what you're working on. If you're developing a SaaS application where an individual instance should be providing group features based on the hostname, suddenly host names becomes a development detail. Though I agree that in most web applications this isn't the case.
I'm sorry, I edited my comment (the broken zone is more troubling to me than the impetus for using it) and made yours look out-of-place. You responded to something accurate the first go, and I agree with you.
