An intricate question rather than an idea: PDF structure LIVE EDITOR

I am wondering whether Dom's outline here(1) is really impossible:
For PoDoFoBrowser, I think it would be fine if you would have the preview side
by side with the pages content stream. And if you type some PDF code into the
content stream, like "0 0 1 rg 100 100 m 200 200 l" it should immediately
draw a blue line. But this is dreaming
I see top expert gurus such as Thom Parker have developed their own viewer/editor here(2), the PDFCanOpener. PoDoFoBrowser is also great. These guys here(3) made PDFXplorer.
So, why I couldn't find a tool like Dom's expectations. Adobe in first place should do that if technically possible. Together with Acrobat, it would exploit the creation of custom annotations.
Are there any reasons they haven't yet?

Karl,
I know you certainly have more experience with the Acrobat SDK than I do; also, all those developers of PDF structure viewers/editors I mentioned earlier must have considered the possibility to make their applications LIVE as Dom's quote shows. So, ultimately you must be right.
Anyway, when you talk about the current transformation matrix, you remind me of the true purpose of such an advanced PDF structure editor I put forward, that is an INLINE editor rather than a LIVE editor where the line here is the development process carried out through the Acrobat SDK itself. For example, say you mouse-draw a straight line in the PDF preview, you should be able to see cosDictionaries and operators to be used within your code. Or, you scale a picture and can check at the same time the transformation matrix that has been used. The reverse is sometimes useful too: you change an element of a transformation matrix and watch the effect in the PDF preview; so, for example, you can rotate a Widget annotation by means of the R key but you can do it in a finer control through a transformation matrix, if I am not wrong.
I think many other examples concerning other PDF structure's parameters configurable in the Acrobat SDK, may be given.

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