There are very few climbers here that have been around long enough to experience the " cement block" drop. The MIT outing club had a setup, near the Uberfall, in the Gunks, in the mid-60's, where a 200 lb. block was hauled up via pulleys, with plenty of slack out, to give the belayer practice in catching falls, using a body belay.
You would be ripped pretty violently off the ground. Perhaps that kind of practice would be more important, than all this emphasis on making things more "complicated".