Actually, no. Physical beauty is as objective as objective can be. A "visual", in Kpop terminology, refers to superficially perceived beauty by the sense of vision (hence the term in the first place). It cannot be subjective because our brain has been prewired to sense and categorize certain matters and symmetry as "attractive". It's only when you combine it with metaphysical components (personality traits, intelligence, etc) that it comes truly subjective.

Boy groups are part of the entertainment industry, which is largely based on physical beauty. So yes, saving a group filled with physically attractive people is an achievement, especially when talent and personality are not lacking in the group itself.