So if you had paragraphs or any kind of one-line-at-a-time "grocery list", you'd have to revamp the post to restore it to what you started with! Not hard, just time-consuming!
Text page elements are only good for a straightforward paragraph of information or for some other kind of information that you don't have to edit often.
In the HTML page element, nothing changes or is lost, and you can just edit what you meant to without a lot of special revamping. This is important to a ceaseless reviser like me--I often re-edit!
It is misleading to all users that we are able to put HTML into a Text page element when it's so problematic to do so! And there should have been a warning about this difficulty with making paragraphs. Anyway, fair warning from me!