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In addition to the other replies here:

PLCs are ruggedised and built to survive for years in the kinds of hostile environment that are frequently found in industrial settings.

And PLC vendors typically provide guaranteed support periods that are much longer (like a decade or more) than those commonly provided by conventional computer OEMs.

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The hardware my company uses has a lifecycle of 15-20 (aka what we typically look at when we consider lifecycle of a plant). This is not meant to be the whole life of a plant, but possibly the life of the current controls. Things/people/companies change. I’ve seen some really shortsighted people rip and replace a sub-decade control system because of “bad experiences”. The industry can be great where it’s great and terrible where it’s terrible.

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