The point about logic is a good one.

I still work part time as an exam invigilator and last week I was having to scribe for a student with a broken arms who would dictate me his answers and I would write them down.

He had good vocabulary and could write good sentences but his answers all didn't seem to follow logical rules and he actually dictated two sentences which said exactly the same thing in different words.

A strong case for introducing it on the curriculum as a core subject?