@Brian2036 Yes, the way it works is that when you get a booking request and accept it, Airbnb immediately starts the process of charging them. If they don't already have their payment method in order, it could take up to 24 hours for their payment to either go through, or he rejected, during which time your calendar is blocked for their dates. (Unfair to host
If you pre-approve an inquiry, the guest can either take the extra step to book, in which case you might get the same 24 hour scenario, or they can ignore it, in which case Airbnb isn't starting to charge them and the dates remain open.
I have actually pre-approved many inquiries that went on to book, which may be not most hosts' experience. But I get the kind of guests who may want to get a bit more info, or ask a specific question before committing, but who are actually serious about booking my place, they aren't just wasting hosts' time sending out the same inquiries to multiple places, never to be heard frrom again.
If the guest is serious about booking, then pre-approving them means they can just take the next step to actually book, without having to then send a request, or me having to accept that request.