I had an itch to rewrite every project after it got large enough and have rewritten some of them. The tragedy of rewriting stuff is that it often ends up becoming more of a duplicate than an improved original. Its hard to see all the edge cases when skimming codebase from afar. Maybe for prototyped code it could work. Not sure if feeding prototype AI slop into AI will produce results though. GIGO. Rewriting code is anyhow not the critical aspect. Its testing and QAing the result and legacy edge cases that's the most time consuming part and that isn't really covered by writing more code.