Earlier quoted context omitted.
For example I might use one sub-unit to conduct a feint to draw the enemy's focus and then use my other sub-units to conduct an attack in another area. If you don't have a checklist to think about that sort of thing almost everyone tends to go into tunnel vision and put all their units on a conveyor belt towards the objective. People still need to be explicitly told to use deception. It's specific useful advice that…
I have to ask. I recall reading that Sun Tzu suggests the value of giving a formidable enemy a route to flee, lest you accidentally force them to fight despite being ready to rout. Is that practical advice in modern warfare? From the cheap seats that I occupy, it seems like the goal is to kill or capture and allowing an enemy to flee is a failure.
The goal is almost never to kill or capture. That’s not why you’re there in the first place, is it? The goal is to achieve some effect. If you can do that without killing or capturing then all the better. If you narrowly focus on killing and capturing then you may be missing other options which are easier. That’s what Sun Tzu is reminding us, and it’s why a modern tactical checklist includes an item like ‘what effect do I want to have on the enemy?’ so you don’t just go straight to kill or capture.