How many times have you recommended a product? without knowing exactly why it works for that specific scalp?
How many times has a client with a straightened hair treatment asked you what other treatments they could get, and you didn't know what to tell them? Most hair professionals learn how to use products, but not how to understand them. They know brands, but not active ingredients. They apply protocols, but they cannot explain why they work or adapt them when the result is not as expected.
Stop following instructions. Start making informed decisions.