As I said, I have one of these degrees, and have hired and worked with many people with such degrees.
First, I agree that the math and (particularly) the statistics classes are useful. Finance and accounting too, in theory, though the vast majority do not seem to internalize much. Business pretty minimal though. A 3-4 years business degree comes with less math education than the first year of an engineering degree, chemistry, physics, etc.
Also.. the majority of business degrees today allow students to avoid most math altogether... and most students do this. The whole thing is continuously moving downmarket. Most business degrees (graduate & undergraduate) are not recognised BAs anymore.
"The market" wants easy degrees with no math. They also don't want accounting or finance. This leaves just the nonsense.
IMO, at this point, most business degrees are less useful than history, philosophy, etc. Graduate salaries are about the same.
Why does it matter if they’re BA or something else? And recognised by who?
And obviously a postgrad business degree is not going to be a BA... because that’s an undergrad degree.
I think if you’re saying a MBA from a reputable school is useless I think you’re being really really silly. I see the opportunities these degrees give you and they are in a most literal sense extremely useful. They also seem academically valuable to me, with fascinating lectures by extremely well qualified people, and visiting amazing institutions.
The only place, where I've seen this super-useless business-degrees actually was a private uni, selling a "marketing" bachelors. Not sure, what the person (acquaintance of my sister) learned there, but apparently it didn't even know a lot about the internet as a marketplace, last time I talked...
Counterpoint: most software developers I've known.
I mean thinking of a typical non specialized business BA here (Germany) the math and statistics classes are pretty useful, as is the basic economics primer. The required law courses and tax related courses are pretty useful. Accounting, finance and controlling are useful as well and so are marketing (mostly math/data analysis), strategy, project management and production management (usually operations research centric but also covers quality management). HR seems fairly meh unless you want to go into HR (as the most relevant stuff is already covered in law).
The typical electives cover more in depth of the above and sometimes business information systems, psychology, programming and the like.
And there's some other stuff that's pretty useful like negotiation classes or case studies (if they cover interesting topics).