There'll always be variations in populations. Whatever possible issues could exist will exist to some degree. Research is needed to identify numbrs, and with enough numbers a label is ascribed to a condition (dyspraxia for movement, dyslexia for reading and writing although it seems to me more amemory issue), but we're all placed in a spectrum of abilities. It's inevitable some people will struggle more with spatial motion gaming, others with reasoning, etc. At the end of the day you can't really account for everyone, and if something doesn't work for someone, either they have to struggle to learn it or accept it doesn't work for them.
For Kinect at large, of the number of people will struggle is significant, then it should have been addressed, but the development stages with testing on selections of the general population would have highlighted this, so I think your test subject is just unlucky.
For Kinect at large, of the number of people will struggle is significant, then it should have been addressed, but the development stages with testing on selections of the general population would have highlighted this, so I think your test subject is just unlucky.