There are upsides to having a story in one central location, however reaching fewer readers than would be possible otherwsie is a high price to pay for that.

I suggest that alternative place should provide readership statistics (as FiMFiction does) and include a note somewhere that canonical place is at FiMFiction (so that discussion will take place there)

OTOH, I would like to know how or where higher levels of discourse can be inspired. Unfortunately, on FiMFiction pictures remain legal tender for comments and there are many shallow comments ("uploading is murder" and the like).