This is only annoying to some people. I don't know if it's part of a person's brain structure or just a preference, but some people are fine with ambiguity and others are not at all.

My personal theory is that some people learn generalized coping mechanisms for various situations in life and other people prefer to memorize scripts for dealing with some situations. We all probably do a little bit of each, but some people prefer one or the other. My theory is that people who like to memorize specific steps to take to solve problems don't deal with ambiguity well.

It reminds us of how little we feel like we have accomplished, which triggers jealousy.