"Onroad yes, offroad no"
Nope, is not true. 1/10 Onroad TC has no saver at all, as a driver you have the choice to use a saver or just a servo lever on the servo.
In most offroad cars (for sure 1/8) there is a saver build in in the steering mechanism. With an adjustable springtension you can adjust is to what ever you want.
But yes, a saver can be disturbing if there is play on it or they are weak.