Why are you rewriting the same application a second time?

I've personally yet to have a situation where that comes up. And every application I've ever worked on has its architecture evolve over time, as behavior changes and new domain concepts are identified.

There are recurring patterns (one might even call them Design Patterns), but by the time we've internalized them we have even less need for up-front planning. Why write the doc when you can just implement the code?