The shonen genre, more than any other anime demographic, is very in tune with the ever-changing demands of its audiences. Even if some genre-defining things tend to stay the same, trends in shonen anime come and go depending on what's popular at the moment. The dynamic nature of the shonen genre gives shows from different generations their own distinctive identities.
Source：https://www.cbr.com/what-modern-shonen-anime-does-better-than-classic/
