Because most people don't really have a problem with binary polls as made plain by the number of people voting in past binary polls versus those who post to discuss whether or not there needs to be more options. I've just looked over my past polls and it is generally the same people who take exception to having only two options. There are even a few people who post rather long answers that, when boiled down, really do fit one or the other response. Plus, the poll is as much to allow lurkers, who prefer not to post at all, the chance to voice an opinion without increasing the post count above zero. Posting or not, in conjunction or in lieu of the poll, all comes down, I suppose, to whether or not someone feels comfortable with the general definition of cinematic.