Blake enrolled at Beacon because she'd given up on the WF and wanted to become a huntress and make the world a better place, just because she doesn't know how doesn't mean she's changed. She still doesn't know how, she's taking it one step at a time. She spent the end of V1 trying to fix the problems of the White Fang. She spent V2 trying to fix the problems of the White Fang, and she's going to spend V4, V5, and V6 trying to fix the problems of the White Fang. She was never lost, as soon as she saw it was the WF doing things in V1 she decided to go stop them.
Weiss went back home because she had no place else to go to and Beacon had just fallen. She is not more determined now. I don't understand how you don't get that. To leave the first time she had to nearly die in combat. To leave the second time she just decided she wanted to leave and got on a plane. Not having her father's money isn't development. Oh wow, she can't pay for everyone's dinner anymore. What character progression.
There is nothing to suggest Ruby is bottling anything up, and even when hearing Pyrrha's voice she had very little reaction. She remains the exact same naive, hopeful, silly little girl she was in V1E1.
Yang clearly ISN'T affected by her maiming or she wouldn't have no fucking problem jumping at the chance to fight strangers. Don't be an idiot, her fighting style is fucking identical to exactly how it was in the yellow trailer--you know, that fight where she initially went defensive against the twins and then Melanie, waited for an opening and then attacked? She hasn't learned shit, and she has not changed at all. If Vernal had been with the group of bandits to ambush her, she would be dead right now.
The only changes the characters have gone through are shallow ones, clothing, abilities, "I'm made at Blake but an episode or two after we meet up again it will be like nothing even happened".