Right, so the author should not have called them "weird edge cases"; forgive that typo and the main point stands: This is a domain where upwards of 20% of case

Right, so the author should not have called them "weird edge cases"; forgive that typo and the main point stands: This is a domain where upwards of 20% of cases do not fit standard frameworks. That's not unusual for medical situations, especially in this area where it is a combo of biology and social factors. The problem with the "law up front" is that often this means that the unique cases get ignored or no resources.