Regular forum readers are arguably the most dedicated of an MMO's playerbase, but they are also the loudest and always a minority. This has been known for years in the MMO genre. We do not represent the larger playerbase. We read articles, wikis and forums on the game while most people simply just want to play the game, not do the research and have the in-depth knowledge that we tend to gather. Our concerns only reflect a part of the playerbase.
If we were a majority then there would not be GW2 players not learning how to dodge or use other basic mechanics. Mechanics that any forum goer knows very well.
There must have been significant numbers of player who aren't learning the basic mechanics or else ArenaNet would not have wasted time and resources developing the new player experience. How well they implemented this is clearly be a matter of debate, but the reason for it was based on the internal metrics ArenaNet has of their game. ArenaNet is an effectively run business, they wouldn't have been around this long if they weren't and effective businesses don't waste money unless they have evidence it is needed.
And frankly it's little wonder if the devs do not appear to be responding to the posts seen on forums. Having read gaming forums for years, one learns the posts can often be contradictory, short-sighted, inflammatory, over-reactive or frankly certifiably insane. For example, few forum foes would see any need for a new player experience. They already know the game mechanics and thus most never understood any need for it. But not understanding a need does not make the need go way. I do not envy any developer's task of trying to sift through the crazed, although highly entertaining, babble on gaming forums to find out the kernels of truth.