In an automatic, wouldn't normal engine braking allow the wheels to convert vehicle kinetic energy into engine movement?
Yes it does
The problem is in automatics because in drive the wheels can't turn the engine
That is simply not true, automatics will engine brake, but it might require locking out the higher gears as your speed decreases.
I had an "engine quits at high speed" scenario on a very busy interstate in Atlanta a few years back. The fuel filter on my Toyota Corrola (auto trans) plugged, it was completely fine one moment, and then it was like the hand of god reached down and killed the ignition. It was a white knuckle experience, but I was able to get over to the shoulder.
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