"Really" in this context means that an answer has already been provided by someone but you object to the rationale given for this provided answer, particularly because it's too shallow. In other words, it's not a description of the problem the question asks you to solve, it's a description of the context in which the problem is to be solved. So the fact that it can be done with any sentence doesn't mean that it provides no information, just like "Like I was discussing with Joe last week, is the sunk cost fallacy a fallacy?" doesn't provide no information.
I just finished the first draft of my essay, "Are Sunk Costs Fallacies?"; there is still material I need to go through, but the bulk of the material is now there. The formatting is too gnarly to post here, so I ask everyone's forgiveness in clicking through.
To summarize:
(If any of that seems unlikely or absurd to you, click through. I've worked very hard to provide multiple citations where possible, and fulltext for practically everything.)
I started this a while ago; but Luke/SIAI paid for much of the work, and that motivation plus academic library access made this essay more comprehensive than it would have been and finished months in advance.