3D is an amazing tool for 2D artists. Ask those that use it in their process, and they'll have no shortage of reasons why. The problem is that many of the reasons aren't obvious to painters. In fact, I'd argue that many of the most powerful reasons to learn 3D only become clear once you start learning 3D. Clearly this is an issue.
Though it's impossible to list the reasons why you should start learning 3D software, this video is one neat example. If you'd like to know more about 3D software, my new "3D paintover starter kit" is a great roadmap -- and it's all from a 2D artist's perspective. Check it out!