Is it better to pretend that solo diving can be made to go away or minimized to an insignificant minimum, or is it better to accept that some will engage in it and find a way to make it as safe as possible?
The same can be said of all the tech courses. I am sure at one time there was no cave, deep, wreck, training courses. But there were divers doing these dives and many more who were willing to try them. Today, thanks to these courses, those who want to try this type of diving can take a course and be much safer doing it. These activities have been made available to many more people and they are able to practice it in a much safer way than if this option was not available. Where would we be today if instead tech diving was stigmatised and shunted due to its greater inherent risk?
Not providing adequate training for an activity many want to do, will keep some from doing it. But many others will simply take a greater risk then is necessary.
Having a solo tech course is not contradictory to teaching the buddy system in all other cases. Its just another diving option.