Which means you are booking the 12th as if it were your check out date when it isn’t.
Someone who goes by the booking rule and waits until the 13th to book the 12th and 13th, since that is the check out date, will find one less room available for the 12th because you booked it the day before, even though it wasn’t your intended check out.
As I said, some may feel it’s a better system than walking because you are grabbing days you intend to keep, but it’s still a work around the intent of the rule.
Honestly, thoughc I doubt
DVC would go back to it.