rrat: The real reason Kanata is leaving is because she has failed to make good friends in Hololive.

I know this sounds crazy because on the surface, many people seem to care deeply about Kanata.
However, they're still far off for the kind of connection that she wanted.
During her graduation, the final song she sang and started crying during was "kiseki knot", which is generation 4's unity song.
Ironically, generation 4 is the most disjointed generation in the entire company now.

Had Coco stayed, she would have never graduated.