I'm interested if this issue is an outlier or more common. If the motion sickness is more common and you can somehow communicate its prevalence to apple then I could see some change happening.

My initial reaction is that the problem may be very user specific (outlier). Full screen transitions are all over the place in windows/andriod/osx/ios. It may not be worth the ui/ux change for apple to fix it. They would have to add some complexity to settings which is something they tend to avoid.