I can't speak to this but I took a drawing class a long time ago. I'm not very good but it was a lot of drawing circles. When you see people freehand stuff it's kind of wild but that's not how people learn how to draw they're just very good at it from practice. Most of learning is drawing very basic shapes, usually circles, and erasing parts that don't make sense and continuing.
I have been practicing art a lot lately. You can draw just about anything using spheres, cubes, cylinders, and cones. You start off with the 2d versions.
True, I did some amateur vector art (in Illustrator) and you basically have to compose objects out of basic shapes. It is truly highly meditative.
> drawing very basic shapes, usually circles, and erasing parts that don't make sense
There's a hilarious Spongebob bit [0] where Squidward is teaching an art class, and he starts off in that exact manner of trying to draw a perfect circle, only to have Spongebob subvert the entire idea. The whole episode is artistic gold IMO.
0: https://www.youtube.com/watch?v=vTlpFEvmxdM