Was just about to post this. At least in my experience I think that it's rare for a hiring manager or someone in HR to use an original job description when posting a job. They all Google job postings, find one that fits the title modify the technology parts of it and just post it.

That's because oftentimes the people writing the help wanted ads aren't the same people doing the hiring for whatever team.

companies who are federal contractors are required to hold the requirements bar, or get very angry auditors/federal investigators on their tail.

something I learned at an HR training. So that is useful to prune your search.