Lots of questions in there, so I'll tackle them one by one. Obviously the huge advantage of digital photography over traditional darkrooms is "Ctrl-Z" or Undo. Nothing is set in stone in digital if you have good command of your workflow whereas the chemical darkroom process is far more laborious. That being said, traditional darkrooms are more hands on whereas digital has the buffering effect od working indirectly with your photos through the keyboard, mouse and screen.