Automation can eliminate lots of jobs without replacement jobs.
But other times will also created new higher level jobs.
Especially when automation impacts a companies total cost for a high-demand independently consumed service or product. So that decrease costs can translate into decreased pricing for an upwardly elastic demand. And the revenue growth results offsets the need for fewer workers per revenue.
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But most jobs within a company are only part of a product or service. With other parts not as automatable.
In this case, even automation that produces higher level jobs is likely to produce far fewer of them. Since savings in part of a value chain increase profits but impact total costs, and therefore pricing, at a much lower percentage. So increased demand is less likely to offset job reduction.
This is also true for any product or service from one company whose demand is anchored to any complimentary services or products from other companies.
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Worse still, automation taking over only part of a high employee count, low skill job is very bad for employees. The number of workers is likely reduced, and as the job becomes simpler, their replacability goes up. Their value, and therefore pay and respect, go down.
They start to get managed ruthlessly, like just another part of the overall automation.
I expect the vast majority of Amazon’s headcount, across each of its logistical divisions, fall into that latter category.