The Importance of Clarity in Protestantism

A lot of Protestants disagree about how much is clear. I asked him, well, does the Bible contain a list of essential doctrines? And he said, well, no, it doesn't. So I think that this is important, but you said that it has changed over time. Do you think that since the Reformation, the doctrine of perspicuity has been narrowed in order to make it more defensible?