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| Torque converters provide no direct coupling between wheels and engine, and thus no engine braking, which is why you cannot bump start an automatic. 
But I’m sure you know all of this 
Tom | |
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Most if not all new automatics have paddles, so you can manually downshift. Use it regularly to manage speed down hill, 3rd is usually enough to hold 50 down hill...
I think all electric vehicles will be automatic, and most use regenerative braking
(brakes using the motors to some extent, and usually configurable).
I drove an electric motorbike that had regenerative braking (configurable). It was amazing how quickly you could slow down just by reducing the throttle and not using the breaks at all.
At some stage manual cars will be a thing of the past at least for new electric cars which will be the primary replacements in next 5-10 years