Because he never wanted Phase to be known for the "sad girls", he just wanted a cookie cutter idol company but ended up with the opposite.
Yet it's what sticks to them. Even if he bans edgy stuff like the CWC reactions, fans are not interested in another Hololive or Nijisanji clone. You can easily see why he won't push it - worried about losing sponsors or collab opportunities because of stuff that certain talent have said in the past. If they wanted people like Kirsche or Megumi or whatever (even Nyaru since she's an indie now), they'd have been hired by now, invaders or fresh faces.
Wonder who he will hire next time for Invaders when the time comes, more Tsunderia dropouts or perhaps something else?