But that only applies to “regular” bikes. There is a whole class of bikes called by various terms: “foot forward” or “flat foot” or "pedal forward."
By moving the seat post back they change the angle between human and pedal, so you can be adjusted correctly AND STILL HAVE your foot on the ground when stopped.
Much, much easier for people with shaky balance, or who might be getting back into the cycling thing.
The Electra Townie is one, but there are other brands: