I whole heartedly disagree with at least one of your assertions. I think on a cross zip it can absolutely work.Ton, in your quiz you've possibly forgot to add the button/paragraph "It depends on the pattern".
So, for instance - never for CRs like J100 pattern, never for cross-zippers, A-2s and A-1s etc., but sometimes O'k for carcoats.
Though, am not a big fan of that middle seam feature. To my taste jackets like HBs usually look better when they have a middle pleat instead just a middle seam.
That said the other two jackets you mention are of no interest to me in any way.