That maybe down to driving style though - use of brakes to slow down (as many do and nothing wrong with it) rather than the gears, but having driven a host of cars in nearly 50 years I have to say all 3 ZEDs that I have owned have such efficient engine braking that does suit my style and why I find them such a joy to drive. Probably stems from my days of youth taking part in Production and Classic Car Trials when the only braking you did was with the engine and handbrake .
Diesels and especially the 4 x4 variety with their torque characteristics, are a good example where we know going down a slippery slope you simply rely on a low gear and let the engine do the braking and avoid the brakes altogether and feel the engine doing the slowing - something an off-road experience day would reveal to the full
The 370 in fact addresses the issue rasied by the OP very well with the synchro rev (yes I know heel and toe can do the same but hey, I never got it right all the time ), and quite often when you find the the need to upchange, such as natural increase in speed going downhill, the synchro rev will blip the throttle to match the engine to the road speed and nicely smooths the drive.