A lot of the commenters are linking grey thinking to indecisiveness, but I think these are separate dimensions. The ability to think in a more nuanced way does

A lot of the commenters are linking grey thinking to indecisiveness, but I think these are separate dimensions. The ability to think in a more nuanced way does not prevent you from making a decision. One can be aware of a problem not being reducible to a single T-or-not-T while still being able to reach a decision. The reflex to do this reduction while trying to reach a decision is itself a symptom of infection with black-and-white thinking, in my opinion. Converting a model into a decision is not the same as projecting all components of a model onto orthogonal dimensions (that is, black-and-whiting). Rather, black-and-whiting refers to doing this projection at each step, dropping information and shoehorning conclusions into either being true or false.