9S vigorously shakes his head. Ugh, pass! He doesn't want to do Jack's cleaning!

Still... "Don't you get bored? You're trapped in Rhys' head with no way to interact with the world..."

He's certain he would get bored and frustrated very quickly if he was stuck without a body. Sure, he's been outside his body plenty of times through hacking, but that was just temporary, and often he still had ways to interact with the world.