Aesthetic choices are subjective and negotiable. You're entirely fine just saying "I'd like them to look like X", but that's as far as it goes - subjective preference. Objectively speaking, perpetuating a stereotype that super ripped body-builder types are either effective or realistic isn't healthy for either the actors involved or society in general, which has enough body-image issues to deal with as it is. Them toning it down a notch and not having everyone try to look like The Rock after a three-day sweat lodge session may simply not be such a bad thing.