I've read Mr. Connor's take on matters with great amusement in the past, but being a professional contractor with about 25 years of experience under my belt (albeit in a different sector) I'd like to issue some friendly warnings :
1. The bulk of HR people ar wholly incompetent and generally have no idea whatsoever about what's an actual job requirement or what the work descritptions acually mean. The just know how to but a few keywords in a text search box to scan CV's.
2. They are just as competent or incompetent as any cross section of the population. It's a gauss curve. Which means 20% are utterly useless, 60% are adequate and therefor not good enough to weed out the top 20% of candidates, and only 20% function on a ;level competent enough to actually do their job above and beyond.
3. For the bulk of recruiting firms : see 1.
4. Things only work as Mr. Connor describes if the HR bods subscribe to the same philosophy as Mr. Connor. However, most of them can't even write 'philosophy' properly.
4. If you have to work for a British manager things are often a lot worse than anywhere else. What passes for a 'manager' in the UK is often someone of ill-tempered, bad mannered and generally boorish conduct.
5. If you feel you must walk, walk.
6. All this 'they may need you more than you think' lark is usually hampered by managers being on the wrong side of the Peter Principle curve. They feel pressured by an employee and react viscerally to being put on the spot. There is NO sure-fire way to determine if your argument, however well constructed, is going to generate the logical response you have imagined it will.
7. Be careful withthis one : some people treat you like crap because they are under the false impression you will not break their face because you are civilized, and all the reasons why they regularly had beaten the crap out of them on high school no longer hold true. And that they therefor can insult you, your parentage and your offspring as much as they like. This is blatently untrue. At least it is with me. There is a line. It is not a fine one. It is big, wide, brash in fluorecent colours lit by 10 kW floodlights. Don't cross it. It will be very painful.