I can agree with this to some extent. Part of knowing the 'rules' (for the lack of a better word) is knowing when to break them.
As long as photographers know their materials and what they're capable of, there is no 100% 'correct' way of doing things. The only thing that really matters is that it ends up being an effective print, and sometimes that means we have to get creative with what we do.
Often I feel that the best lessons I've ever learned are those where I screwed up, and I had to either work my a$$ off in the darkroom to get something acceptable, or just reside to the fact that I screwed up. Then I figure out either how to avoid it, or how to use it to my advantage next time.
But in order to know how to break the rules, you have to know what the 'rules' are first. By far, what gives me the least amount of grief in the darkroom is undoubtedly a negative that fits a mid-contrast paper/filter at printing time. That gives me latitude to increase and decrease contrast if need be, and it's a damned good place to be, especially at the start, to be able to control negative contrast to the point that they are easy to print. When a photographer and printer has learned how to make good negatives that print well, by all means branch out and get creative. It only gets better from there. Besides, how would we ever improve ourselves if we didn't seek to explore unknown potential within our materials?