Most new cars with keyless entry have introduced features to prevent relay attacks like disabling the signal after a period of not being moved. Also with the ultrawideband tracking it should be far more secure, there's no way they haven't developed the standard without relay attacks at the forefront of their mind.Keyless cars are stolen all the time in our neighborhood. They usually do it with a relay/repeater. One person stands near the house door and picks up the car key signal which most people leave near the door. A second person stands near the car that picks up the relay and sends it to the car. Boom, car is unlocked and ready to start. These devices are not expensive. If you only use your phone as your key, your primary car keys can always be kept in a safe place, preferably an aluminum box.
Personally I keep my cars in a locked garage and there's also a gate to the property. If they get passed all of that then I probably have bigger issues. My Range Rover Sport also isn't susceptible to relay attacks.