Building sites of any size will have at least one banksman. Their job is to manage trucks off the public roads and onto the site safely. They wear specially marked high-vis jackets and carry an air of authority. They will stop traffic on the main road if necessary and then walk behind you as you reverse onto the site, normally waving their hand to give you directions.
You quickly learn that getting them to stand between you and oncoming traffic is useful, taking their arm waving seriously is dangerous! They don’t know what it is like to drive a truck, have no idea of its turning circle or the way the front tracks as you position the rear. They can’t see what you can in the many mirrors and cameras you have at your disposal, and it isn’t going to be their responsibility if you hit anything.
But life is full of banksmen, whether official or self appointed. Teachers, or bosses, or just well intentioned friends, people take it upon themselves to tell you what to do and how to do it. They too can have an air of authority and appear to be helpful but, just like with the truck, they can’t see what you see, don’t know what you know, and it isn’t their lives that will be affected if their advice turns out to be wrong.
In the great building site of life, don’t take the banksmen too seriously.