It’s not from an operations standpoint. During a ride evacuation, not having a track means there’s no portable “bridge” to put over a bus bar/Track (required by insurance). It means, in theory anyway, fewer exit doors (as opposed to all exits being on the same side of the building), and faster/safer evacuations. Great Movie Ride was trackless (well, a primitive version), and they even used the scenes for catered special events a few times... because there was no track.
It also means no track switches for adding or removing vehicles (or dual-station setups), which are notoriously difficult to maintain and keep operating. Over on Spider-Man, the track switch at the back (near the unloading docks) has been unreliable for a long time, and makes adding or removing a ride vehicle an ordeal at times. Kong, by comparison, just rolls up a door and it drives itself off.
Last thing, is the accessibility angle. Trackless rides allow for a vehicle to load and run out of order, unlike a ride with a single continuous track. That could lead to faster dispatches, and also allow for guests with physical special needs to embark at their own pace. Over at Forbidden Journey, they have two platforms, with one being stationary for those guests (and that’s possible by super-fast track switches, which can also fail like Spider-Man’s switches; another good example is Toy Story Mania with its ADA station/track spur). A far more elegant way to do it would be like how Antarctica does, with a few loading stations, and the ability to just dispatch as fast or slow, as needed. Everyone sees the same queue that way, you need fewer TMs to escort people, etc.
Not saying that F&F will use any of these advantages, but trackless is the direction the industry is going for these reasons.