Funny.... I may be wrong, but I don't remember a SINGLE question on the "computerized" written CDL basic knowledge test that related to the 11/14 hour rules. Or MATH in general, for that matter.
Yes, there are truckers out there that didn't excel in math class. My own brother uses his fingers to count! (boy, was I surprised when I found THAT out!)
But, the 14 hour rule IS quite confusing. And split logging is even more so. I'm a friggin GENIUS and I make mistakes now and then, both in TALKING about it (as the Rev likes to point out) and even occasionally on my log sheet! (twice in 3.5 years IIRC.)

I don't see any NEED to ridicule American workers who put their lives on the line to drive trucks for not being mathematical geniuses. Nor for their sometimes limited use of the language. They are doing something that MANY Americans could never do! If I had to know how to fix the dang MOTOR, I might not be allowed to drive a truck! (I do understand most of it, but I ain't no mechanic!)
What is required MOSTLY here, is the ability to drive the thing, shift the gears, and back it into a dock! And more importantly, the sense to not run over the "mortals." Math is important yes.... but, it's not a deal breaker the way you imply.