Obviously you missed these parts Human beings work much more efficiently in gravity and air than out. We're just used to things being that way. It makes perfect sense to have gravity available in a turboshaft. That way you can have it when you want it and have it off when you don't. If the gravity system is part of the inertial damping system it also makes perfect sense for all gravity generators to revert to a default on/1g setting if they're cut off from whatever normally controls them. If the gravity system is not independent of inertial damping, anyone caught working in a shaft when the ship moved would be a smear on the wall. If it is independent than it may not be necessary.