Why are multiple engines different?

Neil Gould writes:

You only think that because you have no experience in real airplanes.

No, I think that because it's true, despite any idiosyncrasy of human
psychology that causes people to deny it. Many skills and experiences
are not transferable to highly foreign contexts. Being able to hold a
plane in level flight does not equate to being able to taxi. Being
able to taxi or fly with two engines does not equate to being able to
taxi or fly with one engine failing. Furthermore, even speculating on
the unfamiliar scenario is fraught with risk.

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