The hotel is at least a known quantity. You have a pretty good idea of what you're getting into, the expectations are clear between all parties, and you're having a fairly consistent experience between different hotels. With Airbnb you have no idea who or what you're dealing with.
With a hotel, I don't have to worry about a doorman asking me who I am and then having to lie, per the host's instructions (yes, this happened to me). I probably don't have to worry about the pictures being of an entirely different unit and having an entire day of my vacation ruined trying to find somewhere else to stay (yes, this happened to me). I know exactly where the hotel is before I hand over hundreds of dollars.
With a hotel, I don't have to worry about a doorman asking me who I am and then having to lie, per the host's instructions (yes, this happened to me). I probably don't have to worry about the pictures being of an entirely different unit and having an entire day of my vacation ruined trying to find somewhere else to stay (yes, this happened to me). I know exactly where the hotel is before I hand over hundreds of dollars.