I agree with you, anything you post is out there. But, with legacy social media, like Reddit, that permanent record is not two-sided. I've seen so much deletion and censorship on Reddit that even I was surprised, and I was expecting it. I've seen posts selectively have words deleted by moderators to literally change the meaning and argument. That was the aspect I feel Steemit solves better than resorting to outside archives like archive.org.