Agreed, you can use that technique but in my opinion that is only suitable in situations where there is enough grip to hold the vehicle on the brakes preferably not at the top of a long descent. Going down a long steep mountainside descent in neutral wouldn't be wise, the vehicle wouldn't be under control, you need the vehicle in gear to provide what engine braking it can, but also so that if it all starts going wrong you can hit the throttle and accelerate, pulling the vehicle straight. If you weren't in gear then by the time you'd reacted you would most likely have rolled, some of the places I've driven a roll would be closer to being measured in minutes rather than seconds, with help a long way away.
Apologies for going slightly off topic. To recap, selecting neutral and controlling the vehicle on the brakes is one option under the right conditions, or driving though the brakes is another. Both come with experience and practice, but would only really be needed in tough off road driving.
I did select neutral once when in high range and driving on a very icy road, I was trying to slow the vehicle the last 5mph to a stop, but found that I keep losing traction and sliding, I soon realised that I was fighting to stop the vehicle against the engine driving me forward in D, as well as the momentum of the vehicle. Selecting neutral had an immediate improvement in the brakes responsiveness and the vehicle came to a stop. Worth remembering if we have another harsh winter.