Why do flipper's not break off when I play?
Are you referring to a robot that you built, or one that comes with the game?
If the former, there has been pretty active discussion about how to do damage and breakage. Most likely we are going to end up with attachments that break off as an entire assembly, rather than as individual pieces. For now we are focusing on spinners, but we will get to flippers eventually once we have electrical systems sorted.
If you are referring to prebuilt robots, they will be going away and will be replaced with robots that were built in the robot workshop. Everything you see right now is a mock-up that uses physics and damage systems that will be removed from the game.