I do appreciate your explanations GM, I always learn something from them. I think I really started learning about audio when I realized how much I didn't know.
But I think the OP might have walked away with the impression the larger coil will always have less HF response. As I said, loudspeaker engineering can't be reduced to a few sentences, though I have wished many times it could.
Let's postulate an aluminum wire 4 inch coil vs a heavier copper wire 3 inch coil. As you stated, the 4 inch coil is limited by its diameter. But a heavier smaller coil might not be able to reach the point where its diameter becomes a factor due to mass limiting...in this case the smaller coil might have less HF. And of course the rest of the speaker parts...
But yes, certainly, all other things being equal, the smaller coil should have a higher upper BW limit. But I didn't see any such disclaimer in the OP's conclusion.
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