The problem with EDD is that, no matter how well it is set up, it does not factor in the existence of pickup accounts which are in a defined geographical area and must be serviced and contained within a designated span of time. The existence of 20 pickup accounts will fundamentally alter the optimum travel path that needs to be followed for the deliveries on the route.
The IE people who came up with EDD came of age in the "Pac Man" era. They are well versed in pattern recognition, computer programming and map theory, but for the most part they have never had to put those theories to the test in the real world. My route is not a Pac Man game.