No matter which industry you are in, there will always be that person who insist this is the only way that things will work. It could be right or it could be really wrong. There might be a better way of doing things.
Unless you try the alternative and draw your own conclusion, you will never know. Never blindly follow the rule. Understand why the rule exist.
Difference is not between the person who knows how to do things and the one who does not. The real difference is between the person who gives the true, honest shot and the one who hold back.