when the board was first set up, it was set up so that all you had to do to embed a video was post the url.
then we had other people adding plugins that sometimes did the same stuff, which led to multiple ways of doing the same thing. Which isn't so terrible. If not for the number of autoplay complaints (which isn't like overwhelming or anything, but it's consistent), the fact that it's more or less only used to troll, etc etc.
So - basically if we keep the url embed and ditch the other one, people can still post vids like they always could from the beginning, and also it cuts some system fat in that we probably don't need multiple plugins doing the same things, and also gets rid of the autoplay thing.