A horse is not a human, but they are both mammals (and animals, and have bilateral symmetry, and…). I think, so long as we have words to explain both the differences and the similarities and to uniquely identify the individual items, it should be fine.
I guess it says something about me, that I’m interested in naming the largest grouping, “uses DC”, more than in naming the small grouping, “only used DC”. Or maybe it just says I’ve bought WotC’s koolaid.