My example above was just a very quick slice of the entire agile development model. In this particular case, the user story lacked acceptance criteria ensuring everyone understood the goal. The proper action was to reject it, instead of wasting a sprint of time going the wrong direction.

My personal preference for development is the agile method. If it is done properly, it can bring a lot of benefits to the process. Openness is a big part of it, allowing everyone a chance to ensure they are on the same page. It was actively encouraged that everyone participate in the review days to see how the game was progressing at my previous place of work.