[bsder]

> In business, it is said that one ought to focus on core competencies and let other companies handle the rest.

In contrast, "Maximally efficient is minimally robust."

Something that business intelligentsia propagates should be given extra scrutiny. Why should you assume that statement about core competencies is correct, a priori? We have lots of evidence that statement isn't true in general. And we have mountains of evidence that such statements tend to be more incorrect the longer a time horizon you account for.

Vertically integrated businesses aren't rare. Everybody loves being a fabless chip company--until an earthquake or a pandemic hits. Designing chips was not a core competency for Apple--until it was and suddenly you have the M1. GE outsourced water heater manufacturing and lost their core competency to design them. etc.