ITT: old men bitter because they didn't have access to the greatest technological and engineering feats of all humankind when they were children
It might be an engineering feat, but that doesn't mean that kids will benefit from using it 10 hours a day.
5 and 6-year-olds should be riding actual bikes, not riding virtual bikes from their ipad, controlled with their pale and chubby fingers. They should be building things with lego, not playing as lego Batman and Robin in a video game.
(I say this as someone who has spent too much time around children lately. Good luck to them, though. They're gonna need it.)