In-Between was a perfect storm of never-before-attempted scenes (Infinity Room, Wall-crawl), narrative simplicity, and a cast that understood the assignment and executed it with intensity. Chromadepth houses are not traditional. Scares in them require a lot more patience but also a lot more over-performance to make things obvious. That cast just figured it out in a way most other cast can’t.
(Fans tend to forget when they ask for houses to come back, the cast of house is more important to a house’s success than the design).
Regarding the Monsters, the parks have to get approval to use the Monsters for a couple of reasons. One is unity of presentation - Universal, as a company, doesn’t want the parks presenting “classic” if a new, reimagined version is getting announced. Another reason is to ensure what the parks present is fully inline with Universal’s own imaging requirements for rights usage. Pictures “own” the films, so they have final legal authority on how the characters can and cannot be presented.