See Why was my question closed after being forced into Community Wiki mode? and Split Subjective and Argumentative close reason, among others.
There have been many questions on SO that are subjective, yet not argumentative. Questions which were clearly stated (and thus, should not have been closed as "not a real question"), and yet questions which could only have been answered by an indefinite amount of discussion.
I propose adding a new close reason that would permit such questions to be closed, simply because they are "discussion" questions and thus not appropriate for a Q&A site.
The verbiage for the "Subjective and Argumentative" close reason used to include "or would require extensive discussion". I agree with removing that part of the close reason, but thi nk it should be moved separately into this new close reason.