Many things can be expanded out in other media or films and certainly welcome too (I too want to see what happened on screen or comic or book what happened to that lightsabre), but certain things is just brought up out of the blue and isn't well defined or explained within the movie itself. And just leaves it to peoples head cannon to solve it.
It's great when it really provokes discussion in the direction you (the writer) want it to. But the director/writer and Disney don't seem to have a vision other than milking the franchise at the moment. Therefore it left viewers with split ideas over what happened and then it comes to what we have now (with some viewers "apparently" being the vocal "minority"). That's all because of a badly done story.
Just keeps reminding me of the pathetic response that Bioware took and dug their heels in over the ending of ME3. And I feel sad over how this (Star Wars) could potentially end up when it can easily be handled right now.