At least some of those are H1B posts to prove there's no one in the locality with seven years experience with Windows10. Some are also pencil whipping a HR checklist before hiring the bosses kid or the hand picked internal candidate. You want a CCIE and are offering $50K? No one applying is not necessarily seen as a bug.
At megacorps the relationship between the people writing reqs and the actual job are often rather strained.
I could never qualify for my own job req, and I work there. I got in via networking and portfolio. Seriously, HR lists specific versions of AS/400 software and the department doesn't even work that closely with the AS/400 group, ya know. In fact I think my AS/400 password expired, aged out so I need to regain access, although I really don't need it. People in my department "need" windows 8 experience but our desktops are win7? A+ certification preferred because everyone in my great-grand department requires it on paper? You listed the exact model number and firmware version of a specific spectrum analyzer from a company that is no longer in business under that name? Seriously?
See, this is a major dysfunction when combined with the unwillingness to give rejection reasons. How is one supposed to know when they get a form letter rejection if it was because this particular company is actually serious about their asinine "requirements"?
Hiring managers, you are going to get what you ask for.