But I think it is because the design of the game lets you just rush in and out. There is no teamwork, and that's the design of the PvE content its self. It could also be because there is no Trinity, so it's an all out brawl not really needing to work together as much as if you needed a healer, tank, DPS like you would in FFXIV or other Theme Park MMO.
The early game sets you up with short and quick dungeons. This isn't a game where they set you up with ballcrushing dungeons right at the start. If they did, you would see alot of people socializing, mostly about how difficult it is of course.
I wouldn't really call the tank/heal/dps triad as something teamwork oriented on its own. That requires content that incentivizes additional interaction beyond everyone doing whatever their base role is.
Quite a bit of FFXIV content can be cleared just by doing whatever your role is (kill things, make things hit you while killing them, and bringing HP bars back up and maybe kill things if you have time/mp). They quite literally have roulettes set up so you can get into a dungeon and finish it as fast possible with as little interaction as possible (because that takes time) so you can get your tomestones. Most of the time when I run roulettes in FFXIV the most I'll say is "hi" at the start and "good job" at the end.
The only time you're going to see people willingly stop and talk about what they're doing in an MMO is whne the content is difficult and your group has to talk and communicate in order to succeed.
In FFXIV, you will likely not see people talk in dungeons unless it's 1) new people who don't know what they're doing, 2) EX Trial that's already caused a wipe or is known to cause wipes so people double check to make sure everyone knows what the mechanics are 3) Savage content where GG if no one in your group says absolutely nothing (why are you in savage content with a group that doesn't communicate at all anyway?).
The way Blade & Soul is set up it's more like an action game, every class is damage while some have some utility and stuff that lets them force an enemy to attack them (KFM and BM both have threat increasing abilities which more or less lets them function as a tank, except in this game that would make them more like DPS tanks on crack).
Like I said before, you're not going see randoms having in-depth conversations in any MMO group content unless it's difficult or people who are new get curb stomped and need info on the mechanics. There's actually one case that doesn't apply, but that's not game dependant, and that's for whenever someone decides to strike up a conversation instead of waiting for other people to do it for them, and like in real life, results may vary. There's also Faction chat which is quite lively, but the quality of the socialization that occurs there might not be up to snuff.
Went off on a bit of a tangent but oh well. I actually just remembered something that happened the other day, I tried Poh 6 man for the first time and at some point we ended up waiting for Powharan to spawn for about 20 minutes. During that time we talked about random stuff including typing out the lyrics to the english Pokemon opening. I wonder if that's the kind of socialization the author was looking for.