In 2018 Shimano released the Ultegra RX RD with a clutch switch. It appears to help but at a cost in reduced transferred power. My personal experience on a road bike with it is a marginal gain in chain stay protection at a marginal loss in power. I've switched it off. There are cautions about removing the wheel with it engaged and I am guaranteed to do that so I don't bother with it. I think some chain stay protectors work as well.