So sorry that you were given advice that did not work for you. Advice is merely ideas or techniques that have worked for someone else, some advice is more universal than other advice. Yes, I am VERY opinionated BUT if I consider the source more knowledgeable than me, I am willing to try a their way. If it works for me then it was wonderful advice if it doesn't then I seek another method.
I have been very fortunate to receive advice that was extremely useful. As a beginner quilter, I have a lot to learn. When I took my beginner class, we were all novices and many had never quilted anything before. Each of us produced a quilt that were amazing - most blocks had all their points and our quilts were square. Definite proof that we had received excellent advice and had been taught great techniques. Her advice was based on her mistakes and her personal experiences. We have all signed up for her next class!