Not always; sometimes, collabing means revamping or reimagining what's already made. Why should anyone be beholden to one artist's vision on a project that spans generations? Your old Ravenloft still exists, written beautifully into 3E's lavishly interested books. Now we have a new form of Ravenloft to play with. Both Ravenlofts exist in written and digital form. Thus, your truism really doesn't hold a place here. Van Richten's was written by people, not by the suits as Hasbro, so pretending like the people who worked on Van Richten's didn't care about what they were doing is very insulting to the artist's themselves.