GW2 added a grouping feature like 2 months ago? A year after release.
GW2 is the perfect example of why a "community" sucks: in a game where any 5 warm bodies could form a group because there are no roles, people want speedruns only groups: 3 classes allowed. Even today in group listing there is usually a disclaimer or two: no rangers! zerk warriors only! and similar crap. Oh joyful people!
At this point I'll take an LFD every day and twice on sunday, at least I won't have to deal with asshats that think they know better, when in fact they just want to be carried. As I said before, if the content is tough, people will communicate and play as a group. If it's faceroll what you get out of a group is a "hello" and "thx!" at the end when you're lucky and I don't see why you'd want anything different seen that the game(s) in question are what they are.
I remember teaching people how to play back in EQ days: pick them up for a dungeon, give them a few pointers and let them learn the ins and outs of group playing, or raid playing. Now if somebody is not an MMO master right away, groupkicks and stuff are tossed around without a second thought *even* in faceroll content.
In shorts: (/oldfart ranting on) maybe it's because of the people, the instant gratification spoiled brats of today, kids that suck at socializing (/oldfart ranting off), or maybe nobody wants to play the old games anymore, just as we hardly did what our parents did in their youth (sports do not count!).