After you grind a few blades of the same size and shape you will see that the geometry of the blade lends itself to particular lines. You'll run into the same good things and also the same problem areas. When you think your gettin pretty good, you may actually just be getting more familiar with grinding that blade pattern. If you change blade patterns, the learning process starts over again.
I believe a maker can get to anticipating the way the different lines play out in the grind even before the blade is forged or cut. I also believe that to be convinced of this, a maker has to try to make some different shaped blades and see the relationships of lines and cross sectional geometry and how they play off one another. Just thinking out loud. Lin