Behold. The Offcollab Tier List
23 out of 29 Phase girls have offcollabed with each other which brings the offcollab rate to a staggering 79%. Impressive.
For the remaining 6, Michiru and Runie work at their own pace and operate according to their own will. Those two are fine. Remi and Muyu are poor and are saving money for their future. Those two are less well-off but also fine.
Panko and Jelly suffer from social phobias.
Jelly believes that she doesn't deserve happiness unless she works for it and that the work she does is never enough so she can never allow herself to be happy and meet the other Phase girls in-person.
Panko has social anxiety and is scared of being judged by her peers. She believes that if she meets the other Phase girls than her "internet tough guy" persona will be destroyed and that she will be vulnerable. Those are the most likely explanations for Jelly and Panko declining invitations to offcollab.