The whole issue of whether a married woman takes her husband's last name has been discussed ad nauseum.
I would not presume to suggest how you should frame this matter in your own mind. I'm sure you are quite delighted with your opinion on the subject.
But here's something to consider. Assuming they don't sign up on name-outing high school reunion sites, women who change their last names might be harder for that creepy guy from 10th grade to find online.
Of course, maybe he turned out to be a gentleman and a scholar who is happily married himself.
Anything's possible, I suppose