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gwern comments on [Link] A superintelligent solution to the Fermi paradox - Less Wrong
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My understanding of the history is that everyone believed the extended Church-Turing thesis until someone noticed that the (already established) theory of quantum mechanics contradicted it.
I don't think I've ever seen anyone invoke the extended Church-Turing thesis by either name or substance before quantum computing came around.
People were talking about P-time before quantum computing and implicitly assuming that it applied to any computer they could build.
I don't see how one would apply "P-time" to "any computer they could build".
I meant "apply" in the sense that one applies a mathematical model to a phenomenon. Specifically, it was implicitly assumed the the notion of polynomial time captured what was actually possible to compute in polynomial time.