I just finnished the first two lessons of the book, and I'm liking it so far, I feel its giving me a lot of ideas and increasing my creativity by limiting my choices.

However I feel it's very outdated in how it present it's "rules". I understand this is because it is focused on practices of past periods (probably Classical if I had to guess). I don't really mind that in a sense that even if the clasical period is not my main focus I still find it interesting, but I'm a little bit afraid that these rules can become habits at the moment of composing, and if we are talking about modern music (Classical or popular) they would probably be bad habits.

I'm afraid of that because acording to the book it's main purpose is to make all this rules habits by repetition.

What do you think? Is it posible to create bad habits in composition like this or is it something I should't worry about as long as I'm concious that the rules presented on the book are only guidelines to write a specific type of music?