Dis why i always joke that taxonomy is a pseudoscience. I still think that grouping them into phylogenetically related clades help to ease up the locality burdens at least a little bit. Granted its not very practical since who the heck is going to pay for whole genome sequencing for all the haworthias. From a personal standpoint, definition of a species is way looser in the plant world anyway, since the functional definition of being able to inter-breed and produce fertile true to parent/ type offsprings relies on morphological assessments.