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Apparently, and I am also not a drivererist expert, is that engine braking doesn't suffer from brake fade and is safer when slowing down in wet or icy conditions.
At least that is what I was told by my driving instructor who could well have been talking bollocks.
Although, that said, the first time I drove a car in the mountains the hire car company also told me to try to engine brake as much as possible so who knows.
Most automatics have brakes fitted, though 🤷♂️