Except in very few rare cases 99 out of 100 headhunters do not know a thing about ID so there is a certain amount of patience you need to deal with them. They are matching words in a job description to profiles. I’ve found that many of them are on a quest to learn as much as they can about ID and for that they call the most experienced person they can find and pump them (me) for information.
I’ve had to end conversations when I was asked something like “Tell me why some products never make it to production ?” or the classic “How long have you been using Illustrator for CAD ?”