Q: so you don't rework harmonies, melodies, or lyrics after you've written them down?
A: i didn't before 2011. but starting in 2011 my writing process changed drastically. now i write using a mix of text files and quick audio recordings. and i try out lots of different things, and eventually finalize it. i also don't really use paper anymore. but the song  (melody, chords, and escpecially the road map) needs to be final before the recording process, or else it really falls apart.