I think this is important to remember when using new "shiny" technologies. One that comes to mind for me is Kahoot. I have found that Kahoot is a great way to engage students in for example a review of a topic for a quiz. I use it in Astronomy, 9th grade science and other classes. I almost always use it in "classic" mode, where I have quiz questions and students compete for points. However there are other game modes where students earn more time to keep playing or possibly added features to a game by answering questions correctly. At one point there was a snowball fight version where you answered questions correctly to get more snowballs. Those other game formats seemed to capture students' interest, but not really engaging them in the actual review questions. Those were just there to help them keep playing the game. The technology needs to engage students in content to be effective.