I looked at the manual and it specifically shows trees, landscaped routes, things that would preserve Frisco's RURAL look and feel.
Now look to Preston road's most recent additions: PDQ and Wallmart.
NOTHING shown in the manual was implemented at those locations. PDQ is right ON the highway and everything in front of Wallmart was cleared out so that you can see the store from the road.
So either the images shown in the manual aren't reflected by the guidelines, or nobody is following the guidelines in the manual.