It's frustrating to me that we'll most likely never know what happened to cause their graduation. We don't have anything to work with.
When Coco graduated she had a target on her back, and was clearly dissatisfied with how Cover acted (or rather, didn't act) to protect her.
When Sana graduated we knew that she had it rough since debut (by far the most affected by YouTube removing subs, her dog dying and that taking a toll on her), suffered an accident and was left with back problems, plus her job demands too much of her time, and I believe she saw Hololive more of a passion project of some sorts than anything else.
But with Magni and Vesper, what do we got? They just debuted their new models, they had projects lined up, and were even planning to collab when suddenly they went radio silent, then Cover came out with the first statement.
Some people say that "we shouldn't pry", and "it's not our place to know what happened", and if you want to believe that, fine. I just don't share the same mindset. We'll always be curious, and maybe something good can come out knowing what happened.
Maybe Cover was in the wrong and we should let them know we are not satisfied.
Maybe Magni and/or Vesper were in the wrong and, if the issue was severe enough, we should think twice before supporting them again.
That's just, once again, frustrating. Very frustrating.