I have recently playing a lot old events and we changed RDM to WHM and it is much better. On Salvage mp never was a problem (we go lolthf war(ukko) whm(dbox)) and we usually finish way before time limit doing all NMs possible. We did 20 Kirins recently WAR + MNK DD with marches and I can't imagine we could have win with RDMs instead of WHMs (it was close call few times). Nukes on RDM wont really add much. Melee on old events make some ridiculous damage ( like JoT went in slashing mode and my friend on WAR took it down from 80% with sekka Ukko -> Ukko lol). Lol even on something like Jailer of Fortitude it took us like 3 min to took him down with melee on WAR+PLD+THF spamming magic WS and only I on PLD had set for Sanguine. Ukko is a total killer outside abyssea avg about 3k and spiking almost to 6k (and that's with completely lack of good dDex from gear). With Veret Ukon or some other powerful Empy damage added from RDM's few nukes is laughable and it's much better to focus on keeping melee alive. As for debuffs, sure they help but they really no needed. For new stuff imo you will need to take both whm for healing and rdm for debuffs because I think neither of them will be able to handle healing + debuffs.
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