That is interesting, Smittie. And yes, it might mean that dresses fall at an awkward place on you. But show us some dressing room photos so we can say for sure! A regular length calf gives you more options, truly. I would think that knee length (or just above or just below) would work well! Many people do have a "sweet spot" whether that be just above the knee, just below the knee cap, or an inch or two above or below. I find I have a bit of leeyway with a tapered skirt -- it can look good anywhere from just above to a few inches below -- providing it is tapered. Straight skirts have to fall exactly in the right spot (right below the knee for modesty, right above the kneecap if that is not an issue). Wider skirts are better either below the knee, or above.
Part of the reason a higher neckline works for me is my short hair -- with longer hair I have more neckline options. But with age (and fewer pounds than at my highest weight) I do have a slightly bony "breastplate" area that an open neckline can expose too much of, if it is too deep. (A shallow open neck like a boat or even a modified portrait neckline can be gorgeous).
I am short -waisted, too -- not by a huge amount, but by some -- so if the waist dips in, that will extend my legline to some degree.
Oh, also? When my hair is longer my legs look shorter. It fills the space below my face and my calves look shorter in proportion. The shorter hair draws the eye up. An updo would do the same.