<p><strong>The most important thing about rules is that they are not applied differently from day to day but consistently.</strong></p>

<p>Saying a question should be closed because it is subjective and at the same time leaving questions like the cartoons open is highly inconsistent, leads to frustration and discussion  and thus harms stackexchange.</p>

<p>At the moment the old answer from Sycorax (Jul 10 '18 at 0:22) has most upvotes and my opinion on the argument that the cartoon question helps marking new bad questions as duplicates is that this is only true for cartoon-like questions and not for all the other subjective questions which invalidates the argument.</p>
