I'd be interested in what Hahnemann wrote about this and why he disregarded it in the end.
To me, the reason something like Autopathy is appealing is it avoids all of Homeopathy's numerous pitfalls. If you don't do the case-taking correctly or the client doesn't communicate his symptoms, if you don't select the right rubrics or can't find an important rubric, and if you don't choose the right remedy at the right potency out of the possible choices you will have missed the similimum. Aside from potency, Autopathy circumvents all of this.