This is all just like your opinion man and purely subjective and the bottom line is Warmane says no and it's a no. Anything else is just whining. Take or leave it, no one is paying to play here, no one is being forced to play here and if you (and other insist on having RDF) there are other servers to play on. Begging a staff to do something you want is "imposing" your stubborn views on a staff that likes the game the way it is and the staff is the one's that decide to what to and what they want. This isn't Blizzard, so you don't get to whine and cry your way into what you want.
But before I rush out of here, i'll counter some of your points:
1. RDF was horribly implemented for all levels. Pre 80 it just let players be even lazier and dungeon crawl their way to 80. Even Blizzard recognized this as they had to make changes to the way the content is handed to us.
For example; In WoD they nerfed the hell out of the exp from dungeons 90 to 100 so players would actually have to go out into the world. Just because you liked something a certain way, doesn't make it right from a Designer PoV. They also added Puzzles and Treasures into the open world to give players more of a reason to actually look around while they quest.
2. I really disagree with this, "because spending 10 minutes flying to nexus does absolutely nothing to improve the game", actually it does and allowing auto porting to and from dungeons does more harm then it's worth and i've countered this many times on other post i've made.
What it does is empties out the world around the players and ushers them all into instances, thus to new players or even returning players, etc it presents this false dichotomy that the game looks dead or dying, that which might not be true. A healthy game like WoW would have players both running dungeons and out in the world and if traveling and summoning helps elevate that look and feel, then great. No one wants to play in a world where no out is there doing anything.
3. and this is where you have to understand this isn't Blizzard, "Now by disabling RDF you've made no difference in the game experience for people who didn't want to use it in the first place, and made the game slightly less enjoyable for those who did. There are no winners here just a net negative experience for players as RDF was never required to play and those who prefer to form groups using LFG could always still do so". This is Warmane. You're not paying a monthly sub and you're not paying to download the game, so you don't have as many rights as you might think you have around here. If you're displeased with how Warmane chooses to set up their server, there are other private servers to play on. Pretty simple really.
4. "The people who argue that there is some benefit to flying to the instance are probably the same group who sit in Dalaran or Org pretending to be busy while the others have to fly out and summon them", I'll need some proof on this one. No i'm not denying some people are lazy, i mean for crying out loud, you have people wanting 3.5k to 5k GS to run a heroic. So I'm not arguing that there are some lazy people in this game, but also the needs of the many can't be out weighted by the few. This really isn't a selling point for RDF.
I think I hit up that last point you were trying to make pretty well, so I won't push any further and yes I already know you're gonna continue disagreeing with me and I welcome the challenge, but just know that by no means is this gonna make you even close to right.