Re: I agree with this.
Intensity is good, actually it is the most important aspect of good training, but fear is a particular type of intensity that is only good in small doses at a certain level of advancement. Being brutal is not very practical either.
Though I am not sure the Kobukan was actually a brutal place. In fact I don't really have a good picture of why exactly it was known as "the Hell Dojo..." I think people assume that this is because people were getting horribly injured every day, dying, and everyone was making an earnest effort to kill and eat their training partners. But I recall one of the older shihans saying that there were rarely any injuries there.
It could just be that they wiped themselves out with warm ups and then took ukemi until they couldn't stand up again, and that it was very very difficult to make techniques work properly.