Must a user experience be "positive?"

User experience is an important dimension of software development, but it is not the entire thing. 

Sure, a "positive" user experience can increase adoption, but if the business requires things to occur in a precise way at a precise time, then the software has to enforce that, even if it means incorporating unpleasant and unnatural methods to ensure it happens exactly the way it must. 

Accomplishing this means you need to be agile in your thinking, able to see connections and intersections in new and different ways, and not be constrained by conventional thinking.