That's not all true. Yes it helps with tracking your car but also helps with the higher crankcase pressure that is caused from running a hybrid. Like what @El_bigote_AJ mentioned, it will also help with the excessive blow-by. Before I got one, my hybrid was causing oil to leak in cylinders 1 and 4 and giving me more knock than usual on 93 pump gas. After installing my Spulen catch can that replaced the PCV plate, oil stopped leaking in the two cylinders and my knock went down to nothing.No.
My understanding is it's only necessary if you're tracking the car.
Will wait for the smarter guys to chime in.