I believe there is another issue at play as well. The Big Tobacco market expects specific hues of leaf for Virginias, and these have evolved to and from different standards over the years. Cigarette consumers expect the color of the tobacco showing at the tip to be the same from one pack to the next.
While we can clearly say that green leaf after the cure is bad, a light or medium brown--rather than lemon--color may smoke just as well as a brighter cure. I realize they have subtle differences in taste, but that's what home-growers specialize in. If you plan to sell the flue-cured leaf, then consumer expectations of color matter. Otherwise, sample the various colors of leaf that come out of the flue-cure, and enjoy the differences. For pipe tobacco, flue-cured brown always wins over very nicely air-cured Virginia.
I do love the crisp, acidic taste of very bright leaf, but I also enjoy the brown leaf that comes out of the flue-cure.
Bob