That seems to come from those who believe theirs is the one, true, authentic, traditional way, even if it comes from some intermediate era, and all others are therefore 'wrong'.or deliberately denigrate others
Nevertheless, as with some styles of old, some should be dropped, as they're less popular, probably to be re-discovered in the recovery of some videos from obsolete server discs or backup.
I don't think any in social AT would want to go the formal ballroom definition route, so a consequence is multiple styles and variants, frequently personal. Aesthetics will change.