I agree with the sentiment that if you're looking to get your CFA to move into investments/asset management, you probably won't get a lot of benefit from the degree (from a pure technical skills perspective). I also agree that may pure Data Science students move into non-commercial roles, however from speaking to those in my cohort, it's because they aren't aware roles exist for them.

I considered a masters in mathematical finance, but I decided on a pure Data Science degree because it wouldn't be fluffed up with commerce content (I was a finance major and I felt the CFA would give me enough knowledge to apply what I'm learning in my masters now). From networking, the advice I've received from roles that I'd like to go into (more quant work), the feedback is to focus my course on understanding computing fundamentals, which I wouldn't expect to be emphasised in a Masters of Mathematical Finance.

Of course this is all my opinion, and it probably varies based on geography.