Skipping unanswerable questions would be good for everyone. Any answer would be misleading.

But answer choices should not be qualified by anything, because that systematically creates unanswerable regions.

There should be Context and Question, narrowed down any way the questioner wants. Then just “Yes” or “No” without qualification.

That is what a jury does.

Or: allow answer qualifications, followed by an automatic “None of the above”.

Anyone getting a lot of the latter is getting accurate feedback that the choices they posted were too narrow.

Without either fix, the basic logic of the utility will often be broken. Maybe both? Allow questions to be yes/no, or n choices with NOTA.