>>20463649>>20463254Dance performances separate the wheat from the chaff by showing which girls are willing to put in the time and effort and which girls are all talk. If your oshi can't dance in spite of that being in her job description, how can you trust her with anything else?
Also the implicit requirement of physical fitness means that if your oshi can dance well, she's probably hot as fuck IRL. I bet Aki fucks like a goddamn tiger.