Take good note of the title of this post: How I Maintain My Sourdough Starter. Yes, this really is all about me. If you talk to ten people you’ll likely get ten different but perfectly good variations on starter maintenance. This is simply an account of what I do.
The reason I do it is because it works for me. I won’t say I know nothing of the science behind it, nor that the science doesn’t interest me. But mostly I do what I do because it works and I get bread I like from it. If what works for you is to feed your starter pencil shavings and sing “Uncle John’s Band” before adding it to your dough, by all means keep doing that.
I keep one starter. It is a white starter at 100% hydration, meaning that I always feed it with equal parts of white flour and water, by weight. My current starter is one I started from scratch a few months ago.