Israel uses it, Saddam used it, the US uses it w.r.t. Taiwan vs China policy and now Larry Summers is using it – strategic ambiguity.
[W]ith a high-profile appointment like for Fed chair or the Supreme Court, vagueness becomes a virtue. When Senate confirmation is the goal, a candidate wants to maintain wiggle room and let people project upon you whatever their preference is.
What Summers is trying to do is to create a situation in which conservative senators view him as a tough, no-nonsense central banker who will maintain the integrity of the dollar against those dirty hippies who want to debase the currency. Simultaneously, he wants liberals to view him as someone who will do whatever he can to try to strengthen job creation and find creative ways to improve growth.
Now we pretty much know Israel is nuclear but at its strategy’s inception things were not so clear. The US has not had to openly side with Taiwan or China in a significant conflict etc. This is important because it is hard to maintain ambiguity about your true preferences or nuclear status if you have been forced to reveal them in the past. Larry Summers has revealed lots about himself in the past either through policies he has embraced or comments he has made. Even if these opinions were not necessarily about monetary policy, they reveal the intellectual framework and biases that inform his economic worldview. So it is impossible to maintain strategic ambiguity as a stance.