Problem with theming floors is the upkeep. You have maint and cms walking through it daily. Not to mention guests if the ride breaks down. Or if someone spills something/gets sick. Easier to hide with just a black floor than painted. Plus being trackless you would be able to see the layout of the vehicles overtimeThe biggest problem IMO is that the riders’ attention is drawn to the floor when the vehicle leaves the track, but then the floor is immediately abandoned as part of the theming.