I agree some do, but I am very skeptical about most. It's also changing rapidly.
To be clear I'm not disagreeing that a manufacturing engineer role would require a degree in engineering (and countless other examples). I'm pushing back on specifically "most white collar jobs require any degree regardless of what it is".
I believe that assumption is incorrect and harmful.
In combination with oversaturation of university graduates, it's an easy box HR can tick to lower the applicant pool.
Still comes off as jaded and pessimistically biased. Not representative of whole white collar, just some segment in it.
It's VERY different than my direct experience, and indirect exposure including statements I've read about hiring policies at attractive employers.
Since basically anyone can graduate high school nowadays, this proves you put at least some effort into your education without being forced to.
It doesn't really matter if it's low signal, just that it narrows the applicant pool.