Evidently I have not been at all clear, across dozens of these threads, because people are still calling me out by name as advocating a "kitchen sink" game in which anything goes, all the time.
I am not, nor ever have.
I am all in favor of limits, and I agree that part of the DM's job is to enforce those limits. If the group sets limits, and one player refuses to abide by them, then that player is being a dick.
With that hopefully having been made clear, I strongly urge that the DM curb his impulse to unilaterally set those limits without regard to what the players are interested in. I am NOT in favor of these screeds of "This is MY campaign world and MY game only and I really don't give a crap what you want to play, or where you want to explore, or what kind of story you want. Because only I know what's best for everyone, and you should just go away if you don't like being told what's what, you worthless self-entitled pricks. Only I am indispensable and the rest of you are unimportant, empty faces that I can replace at will -- you're very lucky I'm allowing you to participate, because that's how awesome I am and how unimportant you are."
And if you think that's an exaggeration, look at all the people who then earnestly reply, "Yes, that's exactly how things should be."
What I DO advocate is to set limits based on the kind of game the group wants to play, and then stick to those limits. I advocate this not to be a dick or to pick on people, but because, if you don't, sooner or later one of the players says, "Ya know, you guys all want a pirate campaign and Bob here insists that we have to be desert nomads. I wouldn't mind running a pirate campaign. Anyone in?"
To cut off the usual BS about "Well only one player ever disagrees with me, so obviously he is just a problem player so there!" -- I'm not talking about one player bucking the agreement.
If the group sets limits, and one player refuses to abide by them, then that player is being a dick.
If the group sets limits, and the DM blatantly overrides them and sets his own instead, that DM is being a dick.