10mm on either side (1cm, or 3/8") would "fit" while not showing much visible clearance.
Very true. But more importantly it would mean the opening technically meets ADA compliance (31.5" vs 32.28"), which
@Q-man pointed out.
And this is probably one of the reasons why Disney chose to build the stationary load areas. Less than 1/2" ADA clearance doesn't make for a quick load process if you are in a bariatric wheelchair or large
ECV, as those tend to be about 30" wide. That would mean you would have to have rather good hand-eye coordination to hit that moving opening without knocking into a door. (Yes, I know it's VERY slow, but even very slow is probably not enough time if you have a situation where you have to manually back up a dragging wheeled conveyance and try again.,)
I think they are probably going to direct most full-sized and rental chairs and
ECVs to the stationary load loop as a matter of course. Juvenile chairs and "compact" personal chairs should load on the main track quite easily if their users prefer.
(By "dragging", I meant that lateral force is being exerted on the wheels,, making them more difficult to move; not that the chair would truly be moving sideways along the platform edge. If that happened I'm sure the CM would e-stop it instantly.)
I found it interesting that the film showed a single umbrella stroller folded with the child sitting on a lap. I would have assumed that requiring single strollers to be folded would slow down load/unload to an unwanted degree, so I didn't think that they would require it. Obviously, guests can do it if they want to, but requiring it would seem unnecessary.
PS: If the "slightly too wide" stroller referenced above is the Bob Duallie, it is 31.5", which will still fit onto a gondola, though it would probably be advisable to use the stationary load loop.