I'm curious here...I've only ever gotten deep enough into pcb design to modify an open source motor controller. What does this give you that I couldn't get out

I'm curious here...I've only ever gotten deep enough into pcb design to modify an open source motor controller. What does this give you that I couldn't get out of KiCad? From what I can tell, there are autorouters and autolayout and design rule checks. Is it just better execution?