Because without the TTS, Zen would have nothing, if you try to remember the members of Vshoujo most people would only say Melody, Ironmouse and Nyanners, he belongs to the lower ranks where Vale and he lurk, lets just say Zen is the diversity hire that no one care and is only there for brownie points, im still surprised that Calliope even noticed his tranny ass exist
Funny how Kizuna Ai could collab easily with Vshoujo but not Hololive, or maybe this is her promoting her concert in the states still there were better candidates (like HoloEN)
Iirc her simps have told her again and again to remove her limiters at least in Karaoke streams but she refuse, the rrat in her circles is that she want to prevent the same thing that happened to Pekora when she forgot at times her own tick, even mentioned by Sugita himself