To understand my concerns towards the charm that makes Lordaeron what it is, ask yourself this:
How much of the fun in leveling a character is the incentive/difficulty to obtain new gear through quests, dungeons or even crafting it yourself. A huge chunk of that will not be necessary any longer if your heirloom gearslots keep your stats up to par. But maybe I just speak for myself when I say that getting that next awesome blue weapon which will stay with me for the next 6 lvl is kind of what makes x1 especially gratifying.
But what really bugs me is with enabling the rdf you are getting rid of the way we have been communicating. Before we even got to a dungeon and during our battles to the endboss.
I make a lot of groups, be it lowlevel dungeon, endgame daily or raids.
And I get to at least exchange a few words before I invite someone, can decide if I want the fourth paladin in my group or even exclude somebody who manages to act like a dick in the first response I get from him.
Especially while leveling a new char I made most of my ingame friends by conversations that start while we are on our way to the summoning stone, ofc during the dungeon or even after.
Now why would that change? I am totally overexaggerating, right?
Well maybe I just remember what happened when the RDF was introduced in retail. Why would you show good behaviour when you can always leave and find a new group in a heartbeat? Why have a friendly chat, or care about teamplay or letting the tank do his thing properly when you only want to get this over with, check out with some loot and your rdf goodiebag (idk if they enable that aswell).
This surely seems a LOT like overexaggeration. But this was exactly what happened in retail. It ended up making every dungeon a RACE to the end.