I get you.
I did say in my first sentence of that original post AND in my pic post, that manufacturer & year of geometry matter.
I wasn't talking about the exact same bike by the exact same producer either. And I honestly don't think these bikes are 9cm apart. To me, they are damn near identical size & fit wise.
What I mean is that you cannot just say "oh, I ride a 53cm" and just sight unseen(and geometry numbers unchecked) buy your bikes stock and have them all fit the same.

I think we agree on this one, it isn't your body that can handle huge size differences in frames, it is how they are measured and ride that make they the right fit.