So, you say you want a rebuttal, but your own simply dismissess counter-points without thought. Right, I can tell this is going to be a great conversation.
You disagreeing with my point of view does not mean that I lack reading comprehension. It means that you don't like what I said, but don't have anything of value to counter with, so you resort to creating an insult about my level of literacy. You further had no more points to back up your own opinion, so went on to attack my character via a claim that I didn't play during vanilla. (Which, for the record, I did. I can provide plenty of details, but I expect you'd dismiss that too.)
But you want a reason why flying was a good idea. It's not so much that I need to provide exhaustive details as to what flying adds to the game. All I have to do is prove how ridiculous the claims are that flying is BAD for the game. And that's something I can do with hard facts not based on opinions or subjective points of view.
The subscriptions values over a period from 2007 to 2014.
Flying was part of the open world design from TBC through MoP. The same period of time wherein World of Warcraft had its highest participation and subscription numbers. If Flying is so damn harmful to the game, as you claim, then explain to me how subscriptions continued to INCREASE after it was included as part of the game from the launch of TBC, all the way through WotLK. Even Cata and MoP(where subs started to decline), still had higher numbers than WoD and Legion(the non-flying expansions).
It's almost as if flying doesn't actually cause the harm you say it does, and might be caused by other factors.