I think if you stop to read my posts, you'll see that we're on the same page! I did say not to mention it to her, that would be a ridiculous thing to say to a young woman.
If she really hates her name, by no means does she have to wait around for marriage – whether to a man or woman – to change that.
But we're all adults on this forum and we can acknowledge that oftentimes misogynistic practices are societally expedient. People on MN get married to a man all the time despite the fact that marriage is itself an archaic, often gender unequal institution that for example many in the Nordic cultures no longer practice. Or – I've never seen anyone unsolicitedly dissuade anyone else on this forum from wearing a white wedding dress despite the origins of this western practice being slut shaming. Is it "depressing" to mention weddings and wedding dresses on MN?
I've known a few unfortunate surnames. A Hardcock I knew my uni hated her surname. Later on she became a - I can't remember, but something generic like Brown through marriage. Her brother wouldn't have that option. Neither would a Mr Assman I know who gets mocked a fair bit! (Sidenote: the origins of his surname are quite beautiful, the mocking was ethnocentric so maybe this is not the best example, but he didn't like it anyway)
For most people, it would be a palaver plus possibly embarrassing to change your surname, and have to explain it repeatedly personally and professionally. This is more of a natural transition and you don't have to do a whole song and dance about it. Plus you don't have to brainstorm a new emotionally significant surname either, if you're the kind short on inspiration.
Of course 1) some are more confident and thick skinned than others, by all means go for it! 2) I'm not saying anyone should get married just TO change their surname, that's a determined misreading of it 🙄 I'm sure the main thing was that ms hardcock loved her husband. It's just a convenient 2 in 1 if you want.
Less extremely, I've also heard a few British women say they low key prefer their marriage surname (on an aesthetic basis). In fact, if you don't go double barrelled or keep your own surname, maybe the man and woman can pick the one they like best out of the 2.
To be very honest, I think maybe you're just trying to be a bit difficult about a throwaway comment? As I've said before, in East Asian culture we don't take a husband's name, so obviously I personally don't subscribe to the practice.