You reverse at speed…until you crash into a lampost, car, bike, wall etc.
Imagine how much time you then lose while either filling on all the accident forms or being questioned by the police for driving without due care and attention, or worse.
In essence, drive safely amd ignore everyone who has never driven a truck, isn’t responsible for the results and likely just wants to go home early. Faster you reverse, faster you can get into trouble and the more damage you can do. I lost my first job after listening to other people, not recommended.