Yes, it helps getting to more skillfullness faster, if you don't have to reinvent the wheel but keep making throughout, and don't overglamourise the structure. Ultimately the goal is to understand the mechanics and how they interface with the human brain so you can learn to have people feel what you want them to.
"Breaking the rules" is not the same as having none. The rules are there for a reason, only someone who understand at least intuitively how to play the emotional range of humans with art can know how to insert dissonance at the right moment and consistently. This is what personal style is, an emotional imprint through skilled use of repeated motifs, not bad tendencies from unskilled labour.