The Lands upper level was VIP only - perhaps they controlled wheelchair access. The lower level has fire exits, and of course the middle level opens onto the entrance ramp.
Same for The Seas - the upper level was VIP. As was most of the VIP lounges when you think of it.
One thing that may be a pointer is the only Imagination elevator was the glass one, which I would imagine was not fire certified. Everywhere else has `normal` elevators. Imagination had a handicap refuge, as it was called, behind Electronic Philharmonic in the south east corner of the Imageworks.