As to what is used in the studio, again, it varies. Some people will use guitar only work tapes, some will do more developed things, it really has no particular rhyme and reason. Most of the drummers are going to use their own chops and even if they are programming things, what is brought to them is of no real consequence.
If I've given the perception that I am against ANY tools that you might find useful, I apologize. What I am usually talking about is the PRESENTING of those songs to the public. for that I think you have to write more songs, get basic recordings,and present your best ones.
I do the same thing. I go from work tapes on my computer to more developed acoustic guitar vocals, then to fully produced. In some of the things I do, the stripped down acoustic version works best for the songs, particularly when I am doing songwriting festivals and things that call for more stripped down product.I even have one CD, "NAKED", which is pretty much all acoustic stuff.
MAB