You "play" a multiplayer game every day called "Real Life". Do you need a group of people in the bathroom working together to scrub your ass? Do you need people walking with you in the grocery store to make sure you make the optimal purchases? But, guess what, you do like having people stock the shelves with those groceries for you.
Multiplayer has never meant "grouping" until EQ and WoW. Most multiplayer games let you play perfectly fine by yourself, there's just other people around you affecting the experience. And that's where the comparison to real life comes in ... other people affect your experience, like stocking the shelves or building cars or catching a football. You don't have to be up their ass nor do they up yours all the time to enjoy other people existing either in real life or in an MMO. MMOs are all about a shared space, not about being in a group. It's only WoW that thinks you must be in a manual group with strangers to have fun and no other fun is to be allowed.
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This is basically the suggestion I made earlier fleshed out a bit more, so I completely agree.
I don't get this desire to tell people to "fuck off out of my game" when improving their experience will do me no harm and actually increase the resources available to make the game better for everyone.