A major issue the author missed is it is much harder to fire a non-performer in the tech industry today.
It takes 2 quarters (ie. 6 months) to go from recognizing a problem employee to firing said employee.
This makes the risk of hiring the wrong candidate significant as a hiring manager, because a bad hire reflects badly on you and eats up your budget thus preventing a backfill.
On top of that, firing individual employees can lead to litigation risk (even if frivolous), thus requiring hiring managers to go through the extreme song and dance of the PIP process and documented reprimands in order to provide counsel if litigated.
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