3D work, does NOT use the same skills, at least not for object composition. everyone is born with perception of 3D shapes, geometry, lighting etc. its evolved into us, thats why someone terrible at drawing can still look at an amazing painting, and appreciate its greatness, even though they completely lack the skills to do something similar. People can feel reality, 3D work bring everything you make into reality, since it does all the perspective correction, lighting etc. you can be artistic with use of those of course, but again were not talking about that right now. when you do 2D, its a whole different story, just look at drawing, 90% of people cant draw well, but if you draw well everyone sees it. drawing requires skills that allow you to visualize edges on a finished, or partially finished 3d object within your mind and from a certain angle. you need to lay those edges down through action of the wrist, thinking about pressure etc. making a beautiful drawing takes a lot more than appreciating 3d geometry, shading it takes even more. shading you need to visualize volumes, light sources, and line all this up with your lines. again you need to understand artistically use of tone etc, highlights, heavy shadow all this stuff.

in 3d work, what you do is make a shape, and build upon that,it doesn't require the same kind of layered thinking, and you work adaptively, since the renderer does all the PERFECT lighting and form work of your object, you can actually tell whats wrong with it and fix it in a very perception friendly way, which accommodates to humans senses of 3D allowing you to just do whats natural. 3D is more technical in that you need to have spatial awareness of position, rotation etc. but again its all a natural part of human thinking, and thats why non artists can still be very good at it. being artistic IN 3D, requires a different subset of artistic abilities, which also cater to the 2D artists skills, like percieving forms, colour, lighting etc. an artist will know "THIS IS GONNA LOOK NICE" etc. making original stylistic work, that a non-artist just doesnt have enough of a creative background to do.

thats my thinking on the subject at least.