Hmm, when a host states in black and white that a cat cannot be left alone for more than six hours, I do not take it as an invitation for further discussion. I take it as a fact, that the cat cannot be left alone for more than six hours, and move on.
Likewise, hosts looking for solo sitters do not invite families for discussions; in fact, they are rather annoyed when families apply regardless and decline them right away.
However, if the THS wants to quide members to discuss things with each other, what is the point with newly implemented arrival and departure times