Because you havent seen how sausage is made. You saw carefully curated and edited end results, something every influencer pushes to get clicks.

Cosmopolitan leaked how the process looks like: https://www.cosmopolitan.com/lifestyle/a40314356/dall-e-2-ar...

https://hmg-h-cdn.hearstapps.com/videos/creation-loop-165578...

It takes a lot of editing to get something good and not pure nonsense. Its a fancy Content-Aware Fill on steroids. It drops objects from the prompt on canvas and tries to fill the rest while minimizing error.