>>279760573 (OP)In our time, it is no longer possible to write and portray shonen heroes like Goku, Kenshiro, and Baki. This limitation stems from a structural factor of shonen: its target demographic, historically composed of young boys, which strongly influences the way heroes are portrayed.
Dragon Ball, Hokuto no Ken, and Baki are archetypal manga of the shonen nekketsu genre, which is primarily and directly aimed at a male audience. However, masculinity is not a fixed identity; it has changed over time (to say the least), influenced by several external factors (cultural, social, economic, etc.).
It therefore becomes difficult to justify or reproduce the old traditional male archetypes in a modern shonen, as they no longer correspond to the diversity and sensibilities of the modern audience.