Let’s be real here, the anti-RDF arguments are pretty cringe and just simply that. It’s not like they are being forced to use it when they actually have people to play with anyways. Unless those people were waiting for those features themselves.
But we know the real reason why blizzard isn’t using this feature, it’s to sell character boosts. Why let the players level multiple characters through a feature that makes grouping super easy with Heirloom gear since people bought boosts to skip the leveling process? I even bet they’ll remove the heirloom gear at this rate too just because of this.