The appearance of wide hips also signals hip fat deposits, which help with offspring development. Not everyone has a C-section—and the operation has risks. Also, with sexually-selected traits, there is little point in bucking the trend—if you choose to mate with narrow-hipped girls, they will tend to produce narrow-hipped offspring which then no-one else finds attractive. My assessment would be that apparent hip width is still quite a useful heuristic.
The appearance of wide hips also signals hip fat deposits, which help with offspring development. Not everyone has a C-section—and the operation has risks. Also, with sexually-selected traits, there is little point in bucking the trend—if you choose to mate with narrow-hipped girls, they will tend to produce narrow-hipped offspring which then no-one else finds attractive. My assessment would be that apparent hip width is still quite a useful heuristic.