Why would someone complicate things by having a hyphenated name?

I see that many people - women especially - seem to want to have hyphenated names, presumably to retain their identity by keeping their maiden name, which they also incorrectly state to be their surname. Why is this done, when it is easier to just take the name of your husband or whomever you marry? To me, it seems pretentious, over-complicated and draws unnecessary attention to your additional name(s). Also, it seems this would further complicate your child's life in the future, so far as I know, as husbands generally don't do this sort of thing, so the child will have a parent with one last name and another with two. So what benefit is obtained by doing this? I know the nature of this question may make it seem like I live in the past, but I'm just trying to understand the whys and hows of this practice and it currently makes no sense to me.