I have the same questions sometimes. I realized that a good mix of both works for me. However, I cant completely quit Steemit since here you get a reward and even more interaction sometimes. However, the reason I am on centralized platforms is some of the audience and potential brands I look to work with are there. I think find what mix and strategy work for you. ie. Find away to cross-promote one piece of content (ie Video) everywhere that way you don't burn out. When I almost quit Steemit, I realized that I can share my YT content here as dtube vlogs and that keeps me going here