In the safety classes I’ve taken, there’s usually been training (albeit brief) of being aware if others are behind you, but building the habit of using the engine to decelerate that you flash your brake lights and or apply enough brake to trigger them without heavily braking.

This was also an issue when I had a larger manual car with a medium size (4.6l) v8.

At lower speeds <45mph, it was entirely possible for me to be significantly decelerating using only the engine, where I would make sure to at least flash my brake lights several times.

Diesels with a J-brake can also decelerate quite abruptly, though in that case there's still a remarkably loud audio queue from the engine compressing