Well, if I had to guess, I'd say the rest of the instruments are what's missing. Particularly a real guitar arrangement. The end result is slated to be a quasi-four piece band (the drummer also being the singer and rhythm guitarist) plus a few overdubs. No grid editing, and absolutely no pitch correction.
Hell, I haven't edited a drum track at all, not even comping takes together- I'm honestly fine with just using the last take where we said "yeah, that one's good" and moved on", unless there's something really spectacular in one of the other tracks.
Of course, this is the exact wrong way to make this sort of record, building it up with overdubs, but you do what you can with the personnel and facilities available to you.
As the songwriter is not at all a recordist, his demos are by nature skeletons. But workable skeletons, being in tune and in time, with some oddly dark and snarky lyrics. (Who writes a verse about infectious peritonitis?
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