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This is a pretty regular thing, and the threads that draw my eye the most are the threads around PvP, but it doesn't have to be PvP features. It could be crafting features, land ownership or housing features. Players respond to feature announcements as if there was some reasonable expectation that the features would be there, as if the developer said the features would be there, and then changed their minds when all that happened was the developer just had not said anything yet.
I saw this with Rift, Star Wars: The Old Republic, The Secret World, in a recent Shroud of the Avatar thread, Everquest Next and Everquest Next: Landmark threads, and finally in several Elder Scrolls Online threads. I'm sure it was happening before I really started paying attention to it.
Why? Seriously. Why? I can totally understand wanting certain features in a game, or thinking that the features would be an ideal fit for a game, but not thinking that the features will actually show up, just because I think they should be there. I do not understand this kind of thinking. Are people really doing this, or are they just making a big deal out of things to create forum drama?
I can not remember winning or losing a single debate on the internet.