If that is the case why did Microsoft and Lionhead opt to show video mock-ups rather than real product demos? Last I heard Natal doesn't work for children, bla

If that is the case why did Microsoft and Lionhead opt to show video mock-ups rather than real product demos? Last I heard Natal doesn't work for children, black people and fat people. People who turn too quickly, people who sit down, people who clap or just touch hands. People with too much hair. People who's arms aren't raised. People in wheelchairs... In fact the Quiz application, as shown, is completely impossible for Natal. (I'm not a Microsoft employee)