Losses aren't a problem because all solid trading methods will incur losses. The problem is when a trader sees a pattern (price bars or indicators or both) and develops a bias such as "There's no way price will ever get to THAT level, so I can just short here and not worry about a stop loss."
It's not losses that result from following a plan that cause problems; it's the losses that come from not following a plan or from trading a bias that's clearly contrary to what the price behavior is telling you and refusing to cut a loss and/or reverse sides when indicated. (Were you not in the losing position, you'd clearly see the opposing opportunity.) If you're positioned against a strong trend expecting reversion to mean, every pullback fills you with hope that the reversion has begun, while for the trend followers every pullback is an opportunity to add to a winning position or initiate a new with-trend position.
I did start the "Help, I've been chopped thread" a while back to help offer ideas for avoiding unnecessary losses during conditions where no particular side seems to have dominance.
While what you said is 100% true, if the three stages in trading are analysis, discipline and execution, I would say that the losses which you spoke of occur in the discipline stage. Helping a trader with TA is one thing, but discipline is the rough one, being that you can lead a trader to a set up, but can't make him click! However the losses I mentioned result from problems in the more basic analysis stage. The reason being that I all too often see on ET, in magazines, newspapers etc. posted charts that show a clear lack of basic
TA/PA knowledge or the misunderstanding of it. Even something as simple as how to draw a trend line correctly. And, of course, this leads to disaster in the execution stage. That is why I thought we could help correct some, but of course not all, of the basic TA mistakes made in losing trades in a 'What did I do wrong?' thread. And limited to corrections rather than as you mentioned,"...while for the trend followers every pullback is an
opportunity to add to a winning position or initiate a new with-trend position." which would require teaching how to differentiate a pullback move from that of the possible start of an extended reaction or correction on which an entry would not be advisable.
Anyway, as you know much better than I if such a thread would be useful, I'll pass on the idea. Maybe I'll try posting some examples in a 'IMHO... common mistakes made in basic TA' thread.