The critical thing is that Fusion 360 and similar tools use a non-destructive parametric workflow. Everything is defined based on sketches with dimensions and c

The critical thing is that Fusion 360 and similar tools use a non-destructive parametric workflow. Everything is defined based on sketches with dimensions and constraints like "this angle is 30 degrees, these lines are parallel, this is a right angle, this radius is 3 cm" and you can go back in at any point to change a previous dimension, even if it was on the very first shape you started building from. The whole object recalculates from the new design. The CAD addons for blender are helpful for doing some more precise drawing actions (like finding the intersection point of two edges, which blender doesn't normally give you), but they're still fundamentally in a destructive mesh workflow. You have a pile of vertices/edges/faces, you do some editing, and you have a different pile of verticies/edges/faces. There's some stuff doable with non-destructive modifiers, but they're for very limited specific tasks.