It shouldn't be the best if it doesn't require you to tackle the highest tier of content (Coil). Though on the same end, it shouldn't be blown out of the water by handing in a piece of rock (which may or may not have any value, according to Garlond Ironworks) to a couple of schmucks...which seriously irks me with all the lore background behind the relic weapons.
Either that, or add some aesthetic value to it that justifies more than just glamour...why cant my bard use The Artemis Bow as a frigging harp (as told by Gerlot himself, the bow was used as a instrument and a weapon by Gilbert, the first of the Godsbow), but instead I sheathe it then take out a generic wooden harp? Even my washed up Bard NPC uses his bow as a harp!
...but getting back on track, they could have coil be an objective to finish a relic step and make it BiS...something like (and stay with me here, WoW's done this before to some extent) getting x20 Unobtainium from second coil bosses (which are RNG quest drops, but I'm not sure if SE's quest mechanics even allow this), then defeat Nael Deusn Darnus as the final step (which would've been Nexus, using it as an example anyway).
If we're gonna talk semantics, then sure, that'd apply for some classes. But for ones who already have arguably optimized stats on their unweathered weapon (such as BLM with SS and acc) really aren't getting much from their novus, while other classes like BRD (I'm struggling to be accuracy capped with an unweathered rosenburger), I welcome my novus for accuracy melds. In HA comparison, my bow would hardly be *that* much better than the HA one since its meeting my accuracy requirements and boosting a nice det... at least not that much better I'd justify the time sink from Atma alone (which is now debatable, but hey I finished my atma pre-2.4).
I'm probably not gonna get my ironworks weapon because the stats on it are pretty bad, at least not as my first piece; I'd fall far too low below accuracy cap to justify the extra dex and weapon damage.