Less about the actual game than the policy, which I think more developers should adhere to.
http://www.nintendolife.com/news/2019/07/bloodstaineds_developers_had_to_beat_their_own_bosses_without_taking_a_single_hit
More than once I’ve come across a single boss or maybe a couple in an otherwise reasonable game, and felt like the designer responsible was on some sort of weird aggressive ego trip.
That policy should be industry standard. :)