Strange uses - or extremely limiting economics.
Given the costs of 3D printing, finding profitable logically causes users to explore unusual low competition/high value product niches. Until the 3D printing process economics becomes more capable/competitive at complex multi-material printing tasks - it's limited uses will remain in areas where other mfg. methods aren't more competitive - no matter how much hype the media puts out about a process whose limitations they clearly don't understand technically or economically.