It seems to be more common now than it used to be. Many pieces of media, whether written or televised, seem to use it as an excuse to avoid committing to a narrative. It's as if they expect people will simply make up whatever headcanon is most entertaining and therefore the media will appeal to a greater number of people than it would otherwise. Or they've written themselves into a corner and rather than rework the plot to make sense, they simply go "Well what do youuuu think happened?" I hate it.
