They could give RDM the highest tier of DW in the game, and they'd still be the lowest tier melee.
No it wouldn't.
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Yet it's already quite possible to cap healing magic easily through various equipment set ups and use of abilities. There's no reason to duel wield two clubs just just to go around to say "Oh look at how much cure potency I have. You ignore the one shield that matters though, aside from the cure potency augment. Genbu's shield can also have additional - curing cast time as well as -10% physical damage reduction.
Cure potency isn't the only thing that matters for a WHM. Speed and survivability should be equally important. But regardless, your argument is pretty flawed cause the only real purpose you have for duel wielding is stat boosting when it's a combat related trait and should honestly stay that way.
Macro's can be pretty unreliable of your multitasking and limited in lines per macro command. I have to deal with that a lot on DNC. It's painful without using a spellcast and/or playing on consoles.
As stated, if you're going to be using 1 handed weapons you're better off just going /NIN. WAR would get no benefit from having native DW as what sub would you recommend using from a DD standpoint? Yup NIN.
And assuming player skill is equal exactly what jobs is a melee RDM better than?
Just being better than a garage sale THF wearing whatever he found in the laundry basket and dual wielding a thief's knife and heartsnatcher because he leveled it for TH and doesn't care does not mean that your damage doesn't suck.