But why? What possible purpose would there be- to tying one hand behind their back that way? This isn't a coaster at six flags, this is immersive new themed entertainment, and I can't see any reason why they wouldn't use the very LATEST advances in ALL areas of showmanship to create their incredible new rides. New ride systems, new effects, new AAs, newer and more exciting screens- bring em ALL on, and combine them in exciting new ways, says I.
It's needlessly restrictive- like saying to your doctor, "okay, you can operate, but don't use any scalpels. Find another way."
For that matter, where would a ride like Mystic Manor be without projection effects?
In fact, I've wondered if one of my fave destroyed attractions, World of Motion, might have been better off adding some large screen effects, especially near the end- to bring up the excitement after being slowly pulled past all those sets. Maybe then it would still be around, instead of being replaced by the disappointing Test Track.