I'm afraid that what you say is true, but I think it's because those methods haven't been thoroughtly studied, researched and done right. I would like to see the people who have regret it and how did they made them dreads. I have used the crochet and my dreads are starting to have a neat look. It is just my opinion, though, that every method affects everyone differently, as everyone's hair types and condition varies individually. And since the process of the dreads takes a while they need to observe how every method works in short and long term to see the advantages and disadvantages of them. I'm afraid that some, or the majority of hair proffesionals are just not specialized on dreadlocks and their interest is in doing the job and getting paid. In my case I want to experiment with every method possible and see how it works on different people in short and long term.
In my very personal case with my dreadlocks journey I have experimented with different methods. I mostly preffer to let them do their job by themselves, but when I do maintenance (once a month or every two months) I use crochet to take loose hairs into the dread, which sometimes works and sometimes doesn't do much. I have tried back combing and I don't like it much. With clockwise rubbing I have seen it helps creating knots close to the roots making them dread faster. Dread interlocking on some dreads at first I liked it because it feels more organized in the scalp but I think it makes the hair dry slower (I'm not sure yet). And well, I'm still doing experiments on my dreads and still looking for long term results.
Still, I agree with you that the best way to dreads is the natural (neglected) way.
updated by @kalyán.rivera: 05/23/16 11:47:48AM