People with a black or white binary thought process. “We either do it or we don’t”. There’s no room for options and implications. I have to constantly remind to move towards options and implications (with assumptions). Thus, shifting the conversation to a probabilistic decision making that includes on opportunity costs. In this scenario, there’s more than one hypotheses and there’s no dominating “winner take all” option.
My personal experiences is that a lot of people get stuck "in the gray" because of indecisiveness or an unwillingness to exert the effort to POC something. I prefer that strongly opinionated minds demonstrate their ideas work or fail and move on to the next prototype than hold endless conversation.
Genuine questions: Are you in a management position? How do you reconcile the shades-of-grey people with the black-or-white people? What are the strengths and weaknesses of each position, and how do you harness the strengths and manage the weaknesses? Do people change type depending on the situation, or is a grey always a grey and a b/w always a b/w?
Sure there are shades but ultimately as a leader you need to assist your team is making a decision and going forward with it. Your team is there to shade it and give you all the options, even decide on the options. But you are there to break the stalemate and give your team confidence in execution.