This is why Studios typically specialize these jobs. With 3d, there are simply too many steps to get a model from start to finish, and to get 'expert' at all of them would take quite a long time.

When I say higher skill levels, I'm also meaning making everything yourself, not using pre-made textures or models(except typical primitives). But.I feel like getting to the higher skill levels will be faster in 2d art styles. So, I feel that with 3d it will be faster and easier to get to the 'acceptable' level, simply because of all the resources available, and the re-use you can get away with. And as neginfinity said, there can be tons of reuse, not only in the animation side, but with the models themselves.

You can also easily find textures and just splat them onto your models and make some adjustments. But for example, you can directly paint on models in multiple programs, including Substance Painter, so the UVs don't have to be just perfectly paintable any more since you no longer have to paint on them in 2d. The reason is that 3d feels more forgivable, and errors in judgement and lack of skill can be better covered up.

In my opinion, it is much easier to get to that level in 3d than 2d. Now there is a level of skill that I call 'acceptable.' It isn't good, but is 'serviceable' in a lower end game. In my experience, at least for me personally, I've learned that 2d art is generally less time consuming just to do, and less complicated. I've dabbled in both 2d and 3d art, including using Blender to pre-render models for sprites.

Digital art blender