I don't know if this answers the question, but I think one of the big responsibilities of a leader is to make a decision when the decision isn't obvious and it's blocking you.

Someone: "And we're building that shed next week"

Team: <bikeshedding conversation>

Leader: "Let's paint it black, it's not that critical and we can always change it later"

It doesn't matter if its the best choice. Getting blocked on it is too expensive and other people are too worried about covering their own butts that they waste time on it.