No, what I don't get is how some content that OP ignored for more then 80 days made him quit. Clearly this was not a part of the game that the OP cared about, if OP did then this would not happened. If it was the straw that broke the camels back I would understand it, but as the sole reason? No way.
Oh and I have also subbed since 2.0, even played a little in 1.0. What I have seen and actually is a fact is that we keep getting less content each expansion, an easy example is the amount of dungeons we got, in 2.x 3 per patch, in 3.x 2 per patch, in 4.x 1.5 per patch. But anyways that and the fact that the formula for dungeons has not changed since 2.0 is another discussion.
And to be honest I do not find it unacceptable that the OP quit just because of this, I just find it highly unlikely, seeing as, and I am saying this again, the OP ignored this feature for more then 80 days while still playing the game regularly enough to keep the house if OP really cared. But if this is the sole reason for leaving, that is their right.
My plan for the game may also involve quitting it, I will stick around until 5.0 and see which direction they take the game during 5.x. If I like it I will stay, if I don't I will leave. Simple as that. But before I do I may write a longer post about what I think is wrong, but that is because I want to continue loving this game even if that love from time to time is tested. And to those who would love a direction I would not, more power to you but then the game has clearly turned into something that is not for me.
About that foul taste in my mouth... I have been a gamer since NES, of course I have had that taste in my mouth countless times now. I could make a list but will just name this one: Tabula Rasa, game launched in a mess and while the servers went down faster then any other mmorpg I can remember the creator took his money and went to space... yes the a-hole went to space instead of fixing his damn game. Hmm... perhaps this is why I turned into grumpy cat?