I'm not saying you shouldn't discuss the topic, or that some women did do it automatically. But there are plenty of posts - including the one I highlighted - which do seem determined to undermine the decision making of women. And never mind changing your name - telling a woman that they didn't make a decision, aren't capable of making a decision or made the wrong decision...that's anti-feminist.
I also don't see why an active choice to change your name is actually anti feminist though. Any more than I think choosing to be a SAHM is, or choosing a traditionally female job. I think when we nitpick at other women's active and carefully considered choices then they absolutely do get put off feminism.
So by all means discuss the topic, discuss the origins of name changing and what other options are available so it stops being the automatic default, but stop telling women they didn't know what they were doing or mocking their reasons.