Manifold Vacuum Advance what am I not getting?

FYI I posted this quick plot on a specific thread not to confuse the matter asking if this made sense. Since this post is still active I will repost here. I asked if this plot made sense or if I am incorrect. I have not seen any indication it’s incorrect from anyone. But the idea of a better burn at idle and cruise is why I am thinking MY Engine would benefit from MVA not ported.

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