Being that AirBnB is in the customer service field, not really a true marketplace, a customer-centric dispute policy makes total sense. Hosts that can't grasp the concept of "make your customers happy" are only going to hurt the overall AirBnB brand and should be sussed out and expelled quickly.
Oh, I have no disagreement that the default should be to err on the side of keeping customers (renters) happy or at least mitigating unhappiness. At the same time, that doesn't mean that the customer, however unreasonable, is always right. Even hotel chains with great reputations for customer service aren't going to give out refunds like popcorn to every guest who asks for their money back for random trivial reasons. So there's always going to be some judgment involved at the margins especially when the facts are unclear.
The main difference between being in the customer service field rather than a true marketplace is that people are far more likely to complain - reasonably or otherwise - about service than goods they've received. Especially when the customer is used to experiencing (and paying more for) a much higher level of service.
Having very limited accommodation is also damaging to AirBNB's brand.
