Nobody here seems to be able to say the real reason so I'll be the one to do it. From the very beginning, Hololive always advertised itself as Idol agency and its purpose is to create japanese-styled idols. That means each talent is expected to become more like Hoshimachi Suisei who has ceased acting as a virtual youtuber and became the first virtual idol. Some talents would preffer to remain comedian streamers with an anime avatar but every now and then Yagoo reminds them that his dream is not just a joke to be laughed at.