if he has been instructed to fly a heading, he is more likely to ask before he turns - it's basic human nature
It's where this usually ends. An assumption.
You have absolutely no evidence of this, it's just your opinion. In my experience, it makes no difference. A/c have a no higher rate of compliance whether on own nav, or on an assigned heading (
radar heading- you guys crack me up).
If a pilot is on his own nav, he can turn to avoid weather
Tedious, to me, is having to apply techniques that have no relevence today, that are based on waffle, assumption and other baseless dogma.
Cheers.