The answer is simple -- they still have logic to work out. One of the recent SpaceX rockets crashed on the landing because of some basic missing logic. One of

The answer is simple -- they still have logic to work out. One of the recent SpaceX rockets crashed on the landing because of some basic missing logic. One of the 3 rockets wasn't able to produce the expected thrust. [1] The is an easy solution: the other 2 rockets increase thrust to compensate, but this logic didn't exist. [1] http://gizmodo.com/spacex-just-crashed-a-rocket-right-into-its-drone-ship-1782029453 http://gizmodo.com/spacex-just-crashed-a-rocket-right-into-i...