The Sebenza is not perfect! In my mind there is no such thing as a perfect knife, or any perfect tool for that matter. Part of being perfect would surely be QC, materials and workmanship, but the other part would be suitability for any particular job. I wouldn't want to try and use a Sebenza to chop threw a jungle.
The Sebenza is however a very high quality knife, and that quality, as others have said, is because Chris runs a small shop. He isn't concerned about making the most money possible, but wants to make the best knife possible. CNC machines help out a lot here too. They allow him to create multiple pieces that are identical to within very tight tolerances. Trying to do that by hand would be very hard, almost impossible, and much more time consuming.