[agumonkey]

I'd go a bit further, it's more like we lack an evaluation compass therefore we can't even try because we don't know if we will be able to see a difference. You can't anticipate benefits of any path and most of the time it's anticipation that drives your effort (you "foresee" things). Dealing with that situation requires changing this habit and go wander, try to find anything that revives curiosity, gives you a clue, a perspective you didn't have.