That being said their are also examples of what you say working, but I have spoke to many people who have worked on AAA titles on mobile which have spent millions on R&D, with the best possible designers and developers, only to have a game like flappy bird outdo them. This is not only about being innovative, in fact it's sometime not, but rather having a anti-attitude to what the current market is in order to differentiate. Making an app for kids? Ask kids what they want, having a holier than though approach is only going to kick yourself in the face.