I'm not sure about that. Have you read the writing of a recent college grad? I worked with two on a project some time ago, one with a BA in English and another who dropped out of a Mathematics degree.

The one who'd dropped out was clearer and more consistent in their writing than the BA in English. Perhaps math enforces a level of pragmatism that the humanities don't?

Anecdotal, of course, but I've seen this pattern often.