In health care domains we desperately want to believe providers know precisely what they're doing. It's particularly vexing to find out that "facts" are surrounded by an intrinsic level of uncertainty. IOW whatever action a practitioner deems best in a given situation is a judgement call grounded in experience. Sure, that's bolstered by underlying science, systematic investigations and published reports, but still there's no escaping the probabilistic nature of knowledge in the fields of medicine.
The provider you want to have is one who strives to do what's possible up to the limits of techniques and technology, and above all seeks to learn from every patient encounter.
I need to choose words better - rather than "dark arts" I probably should have said "tacit knowledge". I certainly didn't mean to imply that arrhythmias are not well studied, rather, my hope is that we can use AI methods to do better science.
side note: I know EEs who claim antenna design is a black art :-) It also is well studied and yet according to some, it appears magical at times.