Andreas Mogensen, a Senior Research Fellow at the Global Priorities Institute, has just published a draft of a paper on "Maximal Cluelessness". Abstract:
I argue that many of the priority rankings that have been proposed by effective altruists seem to be in tension with apparently reasonable assumptions about the rational pursuit of our aims in the face of uncertainty. The particular issue on which I focus arises from recognition of the overwhelming importance and inscrutability of the indirect effects of our actions, conjoined with the plausibility of a permissive decision principle governing cases of deep uncertainty, known as the maximality rule. I conclude that we lack a compelling decision theory that is consistent with a long-termist perspective and does not downplay the depth of our uncertainty while supporting orthodox effective altruist conclusions about cause prioritization.
Disclaimer: Written on low sleep, and again reporting only independent impressions (i.e., what I'd believe before updating on the fact that various smart people don't share my views on this). I also shared related thoughts in this comment thread.
I agree that one way someone could respond to my points is indeed by saying that everything/almost everything involves complex cluelessness, rather than that complex cluelessness isn't a useful concept.
But if Greaves introduces complex cluelessness by juxtaposing it with simple cluelessness, yet the examples of simple cluelessness actually meet their definition of complex cluelessness (which I think I've shown), I think this provides reason to pause and re-evaluate the claims.
And then I think we might notice that Greaves suggests a sharp distinction between simple and complex cluelessness. And also that she (if I recall correctly) arguably suggests homogeneity within each type of cluelessness - i.e., suggesting all cases of simple cluelessness can be dealt with by just ignoring the possible flow-through effects that seem symmetrical, while we should search for a type of approach to handle all cases of complex cluelessness. (But this latter point is probably debatable.)
And we might also notice that the term "cluelessness" seems to suggest we know literally nothing about how to compare the outcomes. Whereas I've argued that in all cases we'll have some information relevant to that, and the various bits of information will vary in their importance and degree of uncertainty.
So altogether, it would just seem more natural to me to say:
I do think there are many important questions to be investigated with regards to how best to make decisions under conditions of extreme uncertainty, and that this becomes especially relevant for people who want to have a positive impact on the long-term future. But it doesn't seem to me that the idea of complex cluelessness is necessary or useful in posing or investigating those questions.