Perhaps the difference comes from the distinction between "frequent", and "frequency".
No graduate level statistics here, but even under-graduate (math/physics) efforts gave me a sense of the specificity that statistical analysis demands - usually.
With HCB, I wonder how much our impression of "frequent/frequency" comes from the distortion imposed by when his work was made available to the world, in contra-distinction with when it was actually created.
The book that brought rise to this thread is in the nature of a retrospective, as was the HCB gallery show I enjoyed a few years ago. That sort of effort tends to compress our sense of time, and increase our sense of "frequent".