The reason is that the Dragon's Crown Sorceress has proportions that are so exaggerated, it's actually turning off many heterosexual male gamers. Note that the pile of complaints about that design can actually be cleanly divided into two separate stacks:
1. The design reduces a female character to a purely sexual object.
2. The design is ugly.
Note that people who make the second complaint are judging the Sorceress design specifically on its merits as a purely sexual object. What these two parties want is not actually the same thing. Members of the first party would likely find fault with the witch's design (the exposed belly and cleavage are pure fanservice, and are kind of at odds with her sour expression, which implies a certain brusque power and agency not predisposed to dressing sexily). Members of the second party would quietly fap. The furor over Dragon's Crown was so loud because these two disparate groups unexpectedly harmonized.
1. The design reduces a female character to a purely sexual object.
2. The design is ugly.
Note that people who make the second complaint are judging the Sorceress design specifically on its merits as a purely sexual object. What these two parties want is not actually the same thing. Members of the first party would likely find fault with the witch's design (the exposed belly and cleavage are pure fanservice, and are kind of at odds with her sour expression, which implies a certain brusque power and agency not predisposed to dressing sexily). Members of the second party would quietly fap. The furor over Dragon's Crown was so loud because these two disparate groups unexpectedly harmonized.