There is a reason why Airbnb is as popular as it is. Once you remove the reasons to call them at all, and you do not let them solve any guest-host issues by preventing them from coming up in the first place - Airbnb is 'perfect'. The opposite is a bit of a nightmare.
As to input, outside their somewhat inbred culture they are making some efforts in that department. I am part of a program where I get to give personal opinion on their features, and they are indeed now asking discreetly a heck of a lot of important questions from selected hosts throughout the world.