Just to prattle on, I have very mixed feelings about the trackless dark ride system WDW has been enamored with lately. I’ve always felt strongly that dark rides are akin to films, with the audience being moved instead of the camera, allowing for modified versions of many film techniques - zooms, slow reveals, dolly shots, tracking shots, etc. This is the major reason I feel interactive rides are almost universally doomed to failure.
In this light, the trackless system is very problematic. The need to move multiple cars in the same space usually results in wider views and less control over the guests line of sight. The most egregious example of the problems this creates is B&B in Tokyo, which often devolves into a bunch of carts wandering around a warehouse floor. The temptation seems to be to solve this by planting cars in from of individual cubby screens - see the waterfall in MMRR or several parts of Rat - but this is basically just compensating for the rides inability to create physical cinematic effects by literally turning it into a stationary theatre watching a cinematic segment. In RotR this lack of precise control results in a diminished sense of tension and easily missed elements - I completely missed the Finn AA on first ride through and, even after the location was explained to me, almost did so the second time. On MMRR, which I absolutely love, this is a huge problem, as guests in certain cars miss entire effects and zoom through certain rooms without being able to appreciate them.
Basically, I think the WDW trackless system has a huge amount of drawbacks. It seems inferior to the old Doom Buggies and particularly the modern Scoop, which are much more accommodating to the cinematic nature of theme park attractions.