To expand on this metaphor:
Windows and Macs are like automatic cars, for all the people who just use it to get to a destination, it's the obvious and easiest option.
However, some people want manuals. Maybe they want it to race in the car (coding, resource intensive tasks, speed of computer, etc.). Maybe they just like the feel of a manual. Maybe they want to be able to control when the gears change more. Maybe they want to optimize the car for just one purpose. There are many reasons people might want a manual instead.