Ideally, engineering management should have the technical understanding and social skills to recruit. If they don't have the time, that's another story, but for

Ideally, engineering management should have the technical understanding and social skills to recruit. If they don't have the time, that's another story, but for most companies payroll is the biggest expense, hence the most important investment. You don't want to leave that in the hands of people who don't know what they are doing. Third party technical recruiters who don't have a technical background go through orientation and training, and even given that look at the state of things. Managers need to make time to do this or hire someone who can. Dedicated training may help, but not much, and blog posts certainly won't fix this.