It's actually nothing like sketchup, it's a full fledged parametric modeler, which sketchup never was.
Now yes it began its life as a freeform and direct edit modeling, which it’s still it’s main focus.
I believe Fusion 360 is full AutoCAD engine with locked down GUI?
Fusion 360 was spun off inventor not Autocad, it also shares the same core with inventor - Autodesk ShapeManager.
Yes Fusion 360 is very easy to use but it is because it’s basically sketchup with basic CAM, simulation and parametric modeling baked in.