Did you ever experience JII? I'm guessing from your comments, you didn't.
I'm talking about the whole shebang. JII did it with vehicles on an existing track keeping total sync with the "stage" after people loaded in the front on a moving conveyor belt and before going into the more traditional dark-ride portion of the attraction. It lasted for roughly three and a half minutes of the total track time of the ride. The ride vehicles were always on an independent track and turned, omnimover-style to look inward for this segment. For the Rise pre-show and MF, the whole thing is a single fixed turntable. In both of those cases, the whole thing starts and then the whole thing stops. Under normal operation, this
always kept moving. It was a continuously moving ride like FJ and Monsters Unchained but back before the tech for anything at all like those rides existed to manage all of that (obviously, the vehicles weren't on arms, either).
From an experience standpoint, imagine when first going into the ball of Spaceship Earth, if the vehicles turned inward where a scene with animatronics kept pace following the position of the ride vehicles while characters talked to the riders with a linear narrative that lasted a couple minutes until they'd made the full rotation and were ready to go up to the next level and then the vehicles turned away and peeled off on upward towards the rest of the attraction.
This wasn't an "efficiency thing", it was the only way for them to do this kind of thing with a tracked ride system where the scene would follow you rather than you just passing by it. I guess the alternative would have been shuffling people into a room for a preshow before they boarded the actual ride like is common now but this was entirely integrated into the tracked ride system.
JII was not quite a traditional Omnimover chain but it acted like it for the majority of the ride. It didn't stop and go except for the same reasons an Omnimover would with the exception of sometimes having to pause briefly at the start in order to get the timing right for that carousel at the beginning. Once in that segment, it kept perfect pace.
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See that circle in the middle of the layout? That was the carousel where five copies of the same animatronics delivered their same scene to the ride vehicles as they passed by in groups of four, nonstop. When the vehicles had done the full rotation, they moved on and the animatronics went straight into welcoming the next group. If you were in the front vehicle, you could catch a glimpse of the the end of the last train turning away from the "stage" and exiting as you first started to go into that room.
That illustration makes it look like the majority of the ride, it's just your four cars but normally, you caught up to the train ahead of you
much earlier on than that.
If you'd asked most people if it was an Omnimover, using rides like HM, SE, COP as examples, almost any casual guest would have said yes.
The projection stuff was also an innovation someone else pointed out (what was happening behind them wasn't a move on a loop) but that's not the heart of what I was focused on.
