This is a big no no as I have read. Although off the page, mysteries abound, none can be left in the story. Everything has its reason and purpose.
I wanted a character to wander as we do in real life. We all stroll, get lost and ,hopefully ,don´t end up in a ditch. The writing gurus shake their heads in unison. ´Motive´ they chant. You would think finding a motive for every character would be simple. There would be those characters who want to be loved or avenged etc, but what happens to those who don´t know what they want?
This is where the gurus and I differ. Our real world is filled with those who are half sure or not completely sold on the idea or situation. The question is - how do you factor them into writing?