I don't know what you mean abt. traditionally and amount done today. What I do know is those who practiced it in the long distant past obviously did a lot of it but as I said they had a use and real reason for it. Maybe many nowadays don't know why they do it but just do as theiy're told.
Well, it's not obvious to me. In everyday life people would only move short distances and not be spinning or turning under pressure. In traditional koryu - just look around at the various curriculum and method of practice. If they had to move around a lot...they stood up.