To me the idea that I have to do a kind of song-and-dance negotiation with a host by first introducing myself over texting chat, to see if we meet each-other's minimum standards, and then have them personally arrange for how to do the key pickup and dropoff is an enormous turn off to me. Thinking back on the marketing, Airbnb in my mind occupied the same space as a hotel, but actually it's intensely more social than that. I was shocked when I first tried it and found it was so built on a one-on-one experience.
Granted, I only ever did this once, and maybe 6 or 7 years ago at that, but I vastly prefer the idea of an impersonal hotel check-in desk that confirms my stay and then retreats into the background.