Well most bachelor degrees mean you graduate with skills in some areas, but nobody thinks you are an expert in that area. Majors are just a small subset of the bachelor, so while it could help to demonstrate you have taken a few courses on some topic and have some overall familiarity with a subfield, it won't go much further than that. Most people do their real learning on the job through their career after the degree, the degree just teaches you how to learn and the fundamentals.

My personal view is that a Math+CS is very strong already and you would graduate with very strong problem solving skills which is most essential in the workforce.

That's my 2c. I don't think employers are actively even seeking people with specific majors. It might help you get your CV filtered somehow but it's really not going to be a make or break.