Absolutely this idea should be an essential feature to Steemit. I have so many topics I'd like to eventually write about - even blog style or mailing list style - that I know i will get lost on my own profile eventually, haha! I sincerely wish this had been built into the platform from the ground up.
Awesome! Yes I agree another good reason is that you can list things you want to write about in the future and because you put it in your directory you at some point have to write about it, great way to force yourself into achieving your vision :)