The final battle for My Hero Academia's world has accomplished a lot more than providing spectacular fight scenes and writing out certain characters with their deaths or even their redemptions. The heroes' final fight against the mighty All For One has exposed the flaws and paradoxes of pro hero society, and worst of all, none of the heroes can provide a neat solution to these issues.
Source:https://www.cbr.com/my-hero-academia-chapter-401-simpler-definition-for-pro-heroes/