Who asked for the week first?
It is the question that settles almost every clash, and a shared calendar cannot answer it. An entry carries a created-at time somewhere in its history that nobody can see, and an entry somebody edited looks exactly like one nobody touched. The evidence is there and it is unusable.
In Mooring a request is dated the moment it is made, and so is the answer it gets. When two households want the same week the order they asked in is simply visible, to both of them, so nobody has to be believed and nobody has to remember.
Does everything have to go through one person?
In most families it does, and that person did not volunteer. They field every request, they hold the dates in their head, they are the only one who can say yes, and the whole arrangement pauses for a fortnight when they are away.
Everyone invited to a home in Mooring can see what is free without asking anybody, which removes most of the traffic on its own. On the paid plans co-owners manage the home beside you, on the same calendar and with the same authority to answer, so no week is waiting on one phone.
What about the weeks two families would happily share?
A house that sleeps ten is rarely full, and there are weeks when two households would be glad of each other: the cousins together, one family arriving as another is packing up. On a calendar those weeks look identical to the ones a family wants to itself, so the overlap that would have been welcome never gets offered.
This is the loss families notice least and pay for most, because it shows up as an empty house rather than as an argument. Every request in Mooring says whether the stay wants the house to itself or is happy to share, on every plan including the free one. It is a small question that hands a home back several weeks a year.