My feeling is that Role-playing Games Stack Exchange is about RPGs, not about role-playing. That means people should ask about all aspects of RPGs. RPG history has a place here, and some of the history questions have been very popular in terms of votes and activity. It's clear the community wants to discuss game history.
I think when someone asks what an "indie" game is, there are good answers and bad answers, and thus up and down votes. This makes it a good question.
Many questions that some deem "argumentative" have two or three different objective answers, but not an infinite number of subjective answers. Group A thinks indie games are games that aren't like D&D. Group B thinks indie games are author-owned games. Group C thinks indie games are games with a certain DIY feel. Most everyone thinks that one of those three definitions is okay, though they may vehemently disagree with the others.
I say let people ask this kind of question. Let people answer, and let the best answers rise to the top via votes. The very best answer would include all three definitions, right?
I'm not advocating the blessing of every subjective and argumentative question. I'm saying that some of these questions may seem to be troll bait, but that doesn't mean they don't have a few very good answers.