I don't get it either. The notch essentially covers up the middle of the menu bar and is a non-issue when full-screening. Apple essentially encroached the screen into the camera's territory and used the extra few pixels for the menu bar with the notch covering the middle of the menu bar which is typically empty and wasted space.
There's zero impact on full screen apps and non-fullscreen apps get to claim the space formerly used by the menu bar.