Do you decide on the Shurink treatment based on the direction of skin sagging rather than the face shape?

I heard that sometimes Shrink is applied to the entire face, and other times it is applied only to the necessary areas.

However, if the location where sagging begins varies from person to person even with the same face shape, I am wondering if it is more important to look at the actual direction of sagging rather than simply selecting a fixed area like the jawline or cheeks.