This might be more of a personal nitpick, but I guess it's also unpopular in the sense that I have not seen others talk about it
I don't mind all the groups being big and most of them having a rotational format nowadays. What does bother me is how most of the groups have the same total number of members at the moment. It irks me to no end that out of 6 groups 3 of them have 10 members. Also, I love Tsubaki's new gen and yet I wish they had added for example 3 new members only because it irritates me how both Tsubaki and BEYOOOOONDS now have 12 members. Not to mention that most of the time odd numbered formations look so much better compared to even ones