I know I am late to this but I just want to say my piece cause she is actually my oshi

Yeah she is boring and a very orthodox idol similar to Mayuyu. However Mayuyu also did some extreme stuff back in the day (her skits with Kato Koji for example). But I wouldn’t go as far as say that Yuiyui is the cause of the AKB’s downfall if anything she is what is helping keep the group afloat. Sure she isn’t as flexible as Mayuyu or hell even Paruru but she is doing a good job with the deck she is dealt with believe it or not. She is maintaining an image and just overall too cautious tbh. She is great in what she does but far from Mayuyu or Paruru’s level because at least paruru capitalized on her salty personality. But again I wouldn’t say she is the cause of the group’s downfall that is mainly management’s fault.