I agree that it is important. However, saying to use money management is easy, the not so easy part is knowing how to put it into play, how to find out what works and what doesn't.
As far as the trading strategy only trading once a week or so, the problem with that picks up if the person finds a strategy that was intended to be a day trader style, and thinks "oh, new trader. should only trade 1 or 2 times a week at first." And then proceed to lose their entire account, because they didn't have enough knowledge. Hopefully they figured this out under a demo account, and not a real one.
I think a large part of successful trading is emotion, or rather lack of, so large in fact that only a small part of it falls under Money Management, but in that part, controlling emotion plays a large portion of the overall idea of MM, specifically, greed.