Most of the job hunting advice I've read (in books like "The Hidden Job Market" and "What Color is Your Parachute") suggests finding your niche/passion first an

Most of the job hunting advice I've read (in books like "The Hidden Job Market" and "What Color is Your Parachute") suggests finding your niche/passion first and then looking beyond posted jobs. So instead of blasting your resume to every job post that's halfway relevant (which everyone else is doing) you are basically pinpointing your dream job and networking your way into it. The reason why job posts like the one you're talking about have such specific requirements is because they get 100s of applications for each role and have to have some way to filter them.