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The job posting exists because the previous person left without being able to renegotiate salary and the business doesn't deem anyone in the role indispensable.

If management is this bad at estimating the work involved, they’ll probably underestimate retraining and just take the next sucker who comes along instead.

yes. seen it happen. when management just doesn't get it, they think the "super person" who just quit is easily replaceable.

and what happens next is: the remaining workers at the company compensate for the inexperience of the newly hired person until such time as that new hire truly is a "super person."

that is, in effect, the remaining employees enable management to remain clueless about this stuff until all of the wheels fall off the entire operation.

Desperate or naive people take these jobs, these people only exist where there are more job seekers than jobs. It is a chance for the desperate to finally gain that experience. Being indispensable is not possible in those conditions.