The problem is the lack of innovation on the formula. Many MMOs are the exact same mechanics, quests, dungeons, with a different lore and graphics.
Ideally all classes should be able to farm alone, ideally the grind should not punish adults with limited time.
But I totally agree l, socialization is fundamental to it. I just miss new ways to make players socialize.
I miss Ragnarok Online in this regard, where sitting would recover hp, mp faster, making players often sit and talk while they wait to recover.