When the situation is complex, the people will use short cut. If you learn to do a rap on bolt without testing the anchor, you will do the same in a dangerous situation where your life is threatening and, some time, you will have an accident
I was at a cliff recently and had fun climbing with two good partner. And other party climb aside us an the guy explain me that he "teach" to his friend how to rapp. I asked him if he had climb at canon, a remote area. He said no, but he still teach how to rapp. I asked him if he used many technique to rap (figure eight, not, atc, etc) he said no.
In two or three years, some of the new generation will teach to rapp. They will teach just one method on bolt because he never learned some think else. The new teacher will not even know that other technique exist and how they can make decision to use one technique instead of an other.
Heuristic clue the explanation of that tendency to use a standard method, one method for every thing, as good because it is accept by the majority of people.
Even if it is not acceptable by gravity. Fighting gravity is the only reason of safety