The only way WHM would be able to get native DW is if all jobs got native DW. Also, WHM has a lot of support for meleeing (weapon and JA-wise). Properly geared, almost every job can melee to decent success, save for BLM, SCH and SMN, if they have a single-hand weapon B or above and have SOME sort of JA/JT/spell that help them melee while subbing NIN or DNC. GEO can do it. BRD can do it. Self buffing is the key since they usually lack the power or speed to just melee alone. Will they be doing it in Reisenjima HELM? Probably not. But they can definitely do it in Delve, SR and maybe even Vagary now. Even Apex CP parties if done correctly.