Ive come to the conclusion that pretty much every Hololive graduation, with the exception of Coco (and Aloe if you still want to count on technical terms), is due to the talents getting burnt out on streaming but are feeling some guilt in making their fans wait and don't want to disappoint their expectations of their activity going back to normal. Otherwise they are either capable of still streaming in conjunction with other activities or they feel absolutely no shame in barely streaming at all.