In my opinion, the greatest sin in the mogstation are the retainers. Not because they exist but because they're a cost for failing to provide adequate space for the game. Getting a retainer at a cost should've existed after proper inventory organizational tools, such as mat bag, tackle box, token bag and glam book are implemented. This sin intensified in my eyes after companion app premium manifested, despite SE's claim that they could add no further inventory space to the game.
Anything else in the shop is pure luxury and that's fine to me but retainers are a big no-no to my eyes. Unfortunately, when you have people in fanfests asking for extra retainers, SE will have no incentive to properly implement those organizational tools.
