>>2567387It's a mix of things, I bet.
For one, these girls are incredibly awkward around each other and are probably never going to get over that coworker relationship a lot of them have. They're already socially awkward to a crippling degree, but actually interacting with each other to get some shit going is likely difficult for them.
Two, there's apparently a lot of setup and preparation that goes into making collabs. It's significantly easier to just stream by yourself and be done with it for the day than to work together with other people and get things organized. You have to really want it and be in the mood for it. You can't force this.
And three, management is getting in the way of various collabs, most notably any Coco collabs. I don't think they interfere too much with the other girls and potential collabs, but there might still be some complicated shit there, we just don't know.