Oh I agree totally.
In the Abyssea era I was frequently told, "Oh you have BST? Go solo it" or "Buy a cheap PC so you can dual-box what you need." (I play on console.) Even then no one wanted to share anything.
I could never get into NNI parties because I didn't have a speedhack.
Nowadays it's the same thing. "Oh you can go solo that content now" because no one wants to waste their time or tags, or split drops.
The forums are filled with "so-and-so endgame content is piss-easy, you suck because you can't clear it, noob"-type comments, since the players that are speeding through it have stun bots, mules, and all those fancy gear programs.
SE had to give us Trusts for leveling and quests 'cause no one wants to team up anymore.
I have no earthly idea what they were thinking to let people solo AA's and Salvage, causing enough congestion to prevent a server merge.