I would still disagree with that. Let me put it this way. If you are X distance from the stop sign such that you can put it in gear and downshift as you slow down to reach a stop at the stop sign, it is better to slow down in gear than it would be to coast in neutral and use the brakes. However, it would be even better to have been thinking about this further away, Y distance away when coasting in neutral you would coast just to a stop at the stop sign, and coast in neutral from there, instead of continuing to drive normally from Y to X and then using engine braking.
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