100% agree with you here. it's been an unreasonably long time so whatever you theorize will sound somewhat flawed. A theory that I have is that it largely hinges on the programming of the talking Mickey heads. Unlike Anaheim, Paris, and Hong Kong that just use the articulated heads for shows, WDW's primary Mickey meet and greet based around full on conversations between him and the guests and therefore require more trial and error. Again, you could say that they had enough time to do this, but it's the closest I can get to anything of substance.