Exactly. And here is an example of that inability in the much clearer case:
"How many years after 1945 ... would it take for the Soviet Union to get the bomb? Framed this way, it was a much easier question than forecasting the advent of AGI: The Americans were concerned with only one adversary and the development of a single technology which they already knew all the details of. American predictions of Soviet proliferation offer a highly constrained case study for those who would undertake technological forecasting today."