Silly poll. In what game? In what genre?
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Oh give it up with the 'forced' bullshit. Everytime I see this kind of sentence it activates my bozo filter but I'll make an exception here...
Game design can encourage or discourage things, just a real life can. In games, if you don't have a LFG tool people will tend to join guild so they can have people who they run dungeons with. They will tend to friend good players who seem like decent people for the same reason. Give them LFD and they have an easier and quicker way to build a group so you've now encouraged them to do that. There's nothing 'forced' about it and only some whiny-ass gamer would view it that way.