Ja and? The very same mechanic process happens when a car is accelerating under power, only with a lot more energy being put in and the inertial load acting the opposite way . Let's say you decelerate without clutch. Your engine now acts as a resistance of sorts decelerating the car, but the drive train is not nearly under the same mechanical stresses as hard acceleration. Maybe if you try to use your poor engine as a Jake brake and try to stop using only that, sure (for instance going 5, 3, 1 and not braking at all).
Normal coasting, nah, although it is annoying as **** to have someone in front of me coast to the stopsign from 100m away
You have gears and brakes, use them