Even though he may be able to start working faster, there's no guarantee that the time-to-completion is faster. Also, in a calendar program it's going to be ord

Even though he may be able to start working faster, there's no guarantee that the time-to-completion is faster. Also, in a calendar program it's going to be orders of magnitude faster to change stuff like the design in hindsight. And you're likely able to achieve designs that are physically impossible to do in Excel.