it's about the images people maintain about women scientists, and by implication, where those images come from.
What images are you maintaining about women scientists?
If the Barbie doll line is going to put its trademark doll in a variety of careers, it seems appropriate that scientist (and soldier, and doctor, and programmer) be among these careers. I would be more upset if there wasn't a scientist Barbie.
How women are portrayed is rapidly changing (for the better in my point of view). Right now there are very strong, capable female scientists being portrayed on popular shows; there's Abby Sciuto on NCIS, Ashley on Blindspot, Kosima on Orphan Black and many others. I don't this as a problem in the pop culture that I consume.
My daughter now has every opportunity to choose the profession that interests her (which happens to be engineering). Isn't this what is important?
Sometimes it seems like the ideological goal is to ensure that an equal number of women decide to take up STEM fields as men. I don't see why this is a a very good goal. Compared to my daughter's ability to pursue what will make her happy, this doesn't seem very important to me at all.