Because the built-in support for text views are pretty lame, editing-wise, and to recreate all that Apple provides and more (to make a decent editing app) is a

Because the built-in support for text views are pretty lame, editing-wise, and to recreate all that Apple provides and more (to make a decent editing app) is a lot of work. I'm thinking about a Google Docs serious editor that uses touch gestures more than has ever been done before, with pinch and zoom gestures to change margins, font sizes, etc. Or (para-mode) drag a whole paragraph left or right to move from <p> to higher levels of header.