With fillers, is it more important to consider the three-dimensionality of the face rather than filling in sunken areas?

In the past, when you said filler
I thought it was just a procedure to fill in sunken areas.

However, if you look closely at the face, one part is said to be slightly sunken.
It seemed like filling only that part didn't make the whole thing look pretty.

In cases where the volume of the face has changed slightly with age
I want to know if you make the judgment by considering the overall three-dimensionality as well.