> I don't think the quote is particularly on point in this discussion, but that doesn't make your understanding of Keynes correct (and your misunderstanding doesn't make much sense in the context of this particular discussion either).

It isn't a misunderstanding. Even in the original context, the proposal is to be impatient with something that takes time even if it eventually works. Worse, the quip has memetic fitness (people think it sounds edgy) even though it expresses no limiting principle and can thereby be used in service of every incitement to do something stupid immediately because the smarter thing takes a minute.

It's sometimes true that acting quickly is the better option, but by giving no indication as to which times that is, it's an ambiguous statement masquerading as a conclusive determination and an invitation to do the wrong thing in the common case.