When we adhere to other people's rules and definitions of magic without questioning them or testing them, we become dogmatic and lose out on innovation. For magic to be an effective practice, we need to question all definitions and practices, with an eye toward improving our magical practice and also toward improving magic as a whole.
I recently saw Pan's Labyrinth and one scene in particular that stood out to me was where the girl was looking for a key and there were specific rules she had to follow and if she didn't follow those rules, she could die. She did, in fact, break the rules, and the monster almost got her, but she had chalk and she was able to use it to open another door and escape. The reason was because even though she broke a rule, she understood all the rules and so she could use another rule to get her out of the situation she'd put herself in. To truly be able to experiment in magic, you need to understand the rules so you know which ones you can break and which ones you can bend, and which ones should just be followed. And make no mistake, magic does have its own rules. In fact, you can find some common rules in studying even seemingly disparate practices. But the beauty of magic is that's it something you can also change, if you know the rules.
In fact, rules themselves get changed as people's understanding of what they are doing becomes more nuanced. It's fair to say that rules are ultimately interpretations of how actions should be done, and as such are always subject to revision. What makes a rule effective is the willingness of a person to subscribe to what the rule says. Watch the video below to learn more: