Can you explain why you think Dia was so against Chika's idol group from the beginning? I don't really get why she was against it still, even after we found out the reason the 3rd year's group broke apart was because Kanan wanted the best for Mari.
Sure! From what I understand, a lot of Dia’s initial resistance came from her believing Aqours wouldn’t be able to handle being crushed by inevitable failure. Her experiences in her first year allowed her to know that oftentimes, idol groups aren’t met with overwhelming success, and that groups like Muse and A-Rise could be considered fortunate outliers. I think she was, in a way, trying to protect them, especially once her sister joined.
Another thing I think bothered her was their way of going about their idol activities. A lot of their earlier goals were aimed at achieving popularity and a high rank so they could enter the Love Live, win, and become famous and legendary like Muse. It’s likely that rubbed Dia the wrong way considering her love and respect for idols. She understands that you can’t just become famous by wanting it enough. To be a good idol, one has to put their heart and soul into what they’re doing, and she just wasn’t seeing that with the early Aqours. Plus, seeing them use Ruby to rake in views just added fuel to her fire tbh.
I also wouldn’t be surprised if seeing Aqours so happy-go-lucky about everything brought up some bad memories. When she was in her first year, she was as enthusiastic as the current Aqours was. She, along with Kanan and Mari, really believed they could be idols, and for a while, they could. But reality set in. Injuries, the future, and a lack of any real defining success were instrumental in shaping Dia’s views on idols, and we can see that when Ruby thinks back on the times she and Dia bonded over idols.
Overall, I think she was kinda projecting her own (credible!) views on idols onto Aqours. At first, Aqours seemed to be the same as everyone else. They weren’t going to put in the necessary work to become a great group, so they would simply be average. But perhaps her resistance also be considered a test for Aqours. I mean, after all, she was the one who wrote Aqours in the sand and gave them their name.