Both my husband and I have considered becoming GUE instructors. But the GUE OW class has rarely been taught, and even with the modifications, I think it will continue to be taught rarely, except perhaps through GUE-affiliated shops (which are few). If one wants to teach, and wants to impact divers, teaching a class you will be able to teach regularly just seems like a better investment of time and effort. There is NO prohibition against starting students in GUE-compliant gear. There is NO prohibition against encouraging proper trim and propulsion techniques, or good buoyancy. We do it all the time. We had six students swimming, horizontal and for the most part neutral, on their very first experience on scuba last night.
There is NOTHING in the PADI system that requires that you teach on your knees or put your students on theirs. There is nothing that prevents you from weighting them properly and getting them trimmed out as best can be done with the equipment they are using. Nowhere in Peter's IE was he made to put students on the floor of the pool. Most of the issues come from shops or dive ops that try to run the shortest possible class with the least pool or confined water time they can get away with, but that is NOT a problem with PADI.
There is NOTHING in the PADI system that requires that you teach on your knees or put your students on theirs. There is nothing that prevents you from weighting them properly and getting them trimmed out as best can be done with the equipment they are using. Nowhere in Peter's IE was he made to put students on the floor of the pool. Most of the issues come from shops or dive ops that try to run the shortest possible class with the least pool or confined water time they can get away with, but that is NOT a problem with PADI.