I didn’t get married until I was 28 and come from a very small family with an unusal last name and so I kept mine when I got married. Although I can see the upsides to everyone in a family having the same last name, I also see the upsides to people not having to “become” someone else mid-way through life or career. I know a couple who hyphenated both of their last names and they both go by that, but if their children try to do the same when they get married, it’s going to be a real mouthful!
I also know a lot of people who came here from other countries who go by names they clearly weren’t given at birth and I wonder how they chose their American names. I know several Asian women who go by Sarah (but never Sara).
I guess so much of it comes down to personal preference, which is I think how it should be. Thanks for an interesting take on an interesting topic.