Thank you for the very accurate answer.
I believe in the blockchain as a great technology, but I think it's not really the best tool for user generated content, like here on steemit.
No one really wants his post to be kept forever in the blockchain, for many, many reasons we could easily figure out.
I think that a very visible advice about this way of storing data should be displayed to users before publishing any single post (we can't expect that every user has time and interest to read the legal disclaimer which is basically for layers and other few people).
Our posts are linked to our social media accounts too, with so many issues about privacy, right to delete own content, inappropriate content which may lead to legal problems, copyrighted content, etc.
I hope the developers may re-consider this problems and give some feedback to the community.