We want the programmer to be in control... that is the point of this whole thing. That is also why were are into the library side of the Library vs Framework debate. We don't want to tell you how to write your program, we just want to provide you with some tools to keep the Lines-Of-Code down to a minimum.
Continuations and related forms of state management are very powerful concepts that can be difficult to understand. We'd like to keep you from really having to understand them. Though if you do learn the concept you'll be better off :).
We want your code to be as simple as possible.
What we are layout out here is technique and methodology as much as it is an implementation. The whole thing should be portable to other implementations in other languages, for example.