Requiments change based on availability of labour and is not entirely related to the difficulty of the job.

The exact same type of jobs often have different requirements year-to-year. Recruiters start adding or removing requiments based on how easy it is to find people for a role. It just acts as a filter but is often unrelated to the actual difficulty of the role.

Recruiters don't want to have to judge people entirely on merit as it is hard. They pre-filter the pool to focus their search and make it easier to manage and vary the constraints based on number of applicants.

This means people perfectly capable of doing a job get excluded for a superficial reason other than ability or competence and it overly effects people from a poorer background.

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