Some dedicateds (though not all) have two queens in their second bedroom, while lockffs usually (except at OKW) have a queen and a full pull out.
BWV has no dedicated two bedrooms, they are all lockoffs.
Lockoffs add flexibility to the resort for member services. And we have enjoyed having them when we have adults traveling with us - they get their own "room" with their own exterior door and kitchenette. But a lot of people find them troublesome with kids - which they don't particularly want having their own exterior door.....