I have to agree with Whopity & Fireflybob, I was on an instructor seminar and tasked along with a number of young instructors to do a steep turn briefing, almost all of then saw steep turns as an aerobatic manoeuvre requiring a HASEL check before starting it and the use of a steep turn as an evasive manoeuvre simply had not dawned on them.
Prevention is better than cure so a sharp lookout ( backed up by FLARMor TIS if you have it ) should be the primary defence aganst collision but the ability to enter a steep turn instantly has to be part of the PPL course.
This is viewed from a fixed wing perspective and I am sure the helicopter instructors will have their own take on this subject that best uses the aerodynamic strengths of the helicopter.