It probably has something to do with the fact that the highest paying market for illustration in the post- war years was in the women's magazines, and that every ambitious illustrator had his eye on that, but I am sure that I see so many of these artists putting in a better effort on the romance comics than they tend to do in other areas. I see it in the use of photographic reference for instance, and a striving to make the girls prettier, and everything else more realistic. I find Kida's work on Boy meets Girl to be a revelation, but there are many other artists similarly inspired to work a little harder.
Admittedly I have to turn a lot of pages to find the good stuff, as in other areas, but I do get a better return for the effort in these romance things.