unless you count gear, challenge, achievments, mounts and other collectibles as content, then no...
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if you want to do most difficult content, you have to socialise... same as in vanila...
or you had to socialise to do simple quests? not really... or leveling dungeos? well instead of button in UI you replied "inv" to someone spaming LFM in city, how the hell is that "more social" is beyond my understanding...
what game mechanic in vanila "promoted" socialisation more than today? please humor me, bcs i play since vanila and can honestly say it was not more social
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are you SERIOUSLY suggesting people in vanila were ALWAYS chi-chating in dungeons? bcs if you do... you are wrong
i play since vanila and it literaly depends on group, some people want to chat some dont, it have zero to do with game, and all to do with people