Thanks for linking to this article, AT! I will read anything on necklines I can get.
Personally, I found a lot of the advice contradictory and the article didn't take into account the many body-type modifiers we all have. Also, there are so many different kinds of cowls, halters and boat necks that need to be taken into consideration. So much to learn! It would be a shame to discount a neckline category when a variation of it might actually turn out to be flattering. I guess that's why we need to do so much trying on.