The Japanese anime industry is well-known for repeating successful processes. Manga and anime creators evidently rely heavily on tried-and-true formulas and tropes to meet fans' expectations, and it's a double-edged sword. This creates comforting familiarity and gives demographics like shonen and shojo their meaning, but it also invites a flood of repetitive content that fails to innovate. Relying on heavily-used, formulaic content can stifle a series' potential for originality, so some creators make a meta-statement by subverting all those rules.
Source：https://www.cbr.com/subversion-anime-manga/
