Well, learning from experience will be better if it is felt by yourself, maybe we can learn from other people's experiences by hearing and seeing, but experiencing it directly will open our eyes because we can feel it directly.
The method you mentioned is indeed widely used, and I am one of them. It is an easy and safe way, because we can continue to accumulate bitcoin when the price drops and when there is another drop we will not panic too much because we will buy it again.
If we have our own experience we can learn, and if it is a bad experience that makes us lose, we can learn from it and improve it so that it can be better in the future. Listening to other people tell about their experiences also makes us have more knowledge and can learn from other people's mistakes.
In this case we should not be selective in learning, we must absorb everything we see, feel, and hear. This is one way to make us continue to grow and expand our knowledge.
We can see that successful people are those who are open to knowledge, they will not miss even the slightest new knowledge, especially those related to what they do, in this case investment or trading. Never be lazy to find something new.
Both parties are right, When learning, you must have an open attitude and accept all forms of knowledge is very important to develop. If we do not become selective on what we accept to be true in terms of information we receive, we extend our possibilities, opportunities and strategies that are out there that we may not have thought about before. This broad learning process enables one to keep on learning and actually gain more knowledge in the areas studied such as investment or trading.
Most of the times, success expects successful individuals who are want to learn and constantly seeking for how to make themselves more efficient. It is not enough that they are knowledgeable, they need to be even more knowledgeable at something, and get knowledge that will improve them.