I, personally, am definitely more right-brain oriented than left-brain, but I do well in math and the sciences as well. I'm a software engineer by trade, and math/science are both necessary skills in accomplishing the designing and writing of software. In fact, the greatest software developers will be blessed with both creative and math/scientific skills at their disposal. So, I can do well here if I post good artistic content, reach out to others, upvote them, and leave good, thoughtful comments on their posts.
And, I could succeed with science-oriented (left brain) posts as well as with artistic (right brain) content posts if I follow those same basic, necessary rules for success.
A lot of people, I think, may only see Steemit as a platform for the bevy of artistic types, (that are very plentiful), and may feel like it's too difficult to do well without possessing those kinds of talents. What they usually miss though, is the fact that even the artistic types need to have their stuff noticed, before they'll be getting upvotes on their content. In that regard, there is absolutely no advantage to the right brain Steemians over those who are left brain. To succeed, each must first make a solid effort, using the basics of upvoting, taking time to make good, relative comments, resteeming good content, etc., and making new friends while doing so.