DOrian did use a variation of HIT .... that being HIgh intensity training. There are many variations of this, mentzers, arthur jones style, dorians style, trevor smith style.
All of which take the fundamentals of very very hard work in a short period of time. Working with lower volume and at least positive failure.
HIT doesnt mean one set routine, just like volume doesnt mean doing exactly 15 sets a body part. there are variations of both!!
It comes down to different strokes for different folks. Because you might not like a training style, or do not want to try it, does not mean it doesnt work.
I have done high volume in the past and didnt like it that much, that doesnt mean it doesnt work.
davie