The stupid part is they continue to do this, meanwhile they throw some ugly weird looking shoulders into the loot table,
Im kinda surprised they didn't just drop Mnks into the Mail category when MoP launched. Now with transmogs and Legion is was pretty much to late. As for DH, they just seem to be a Leather class more then a mail class. Just based on Illidans past, he seem to come from a Leather wearer background.