Here we go again!! This one keeps cropping up evey few weeks. If you want the cost of replacing your brake components every other service, go ahead and use your brakes to your hearts content. I have NEVER had to replace a gear box or drive line components due to my driving style. BUT if you drive properly, anticipating what other road users are going to do,- dont just look at the vehicle in front, but at what the vehicles ahead are doing, and be in the correct gear for the conditions you will be a better driver. It does not matter what your preference is - brakes or engine or a combination of both. Mine is: Initial engine braking using the gears,"covering" the brake pedal, then final stopping using the brakes. This has served me well for over 20 years driving Class 1 artics. The advent of even more sophisticated braking systems ( Volvo Engine Brake, and electric retarders for instance), have made great cost savings as the service brakes last approx 5 times longer, and these systems could eventually filter down to into cars, as others have filtered up to trucks.
*NOTE* Double De Clutching for the uninitiated is a method of changing gear by matching the engine speed to the road speed by "blipping" the throttle on DOWN changes, - a waste of time with the syncromesh gearboxes of today- if done correctly, there is no "shock" on the drive train as speeds are perfectly matched, it just takes practice. Where you should not use engine braking, is in an emergency stop if your vehicle is fitted with ABS/ EBS brakes, as these rely on the "drive" to the wheels being disconnected to work properly, and allowing you to steer around the obstruction - hopefully- without losing control.
Matthew : If vehicle has a manual gearbox and the engine is still being "driven" by the road wheels then the brakes will work, as the servo is operated by the vacuum at the inlet manifold. Other systems should also still work until the engine finally stops turning and vehicle comes to a stop.