The reason Atma should get nerfed is because its SO EASY now to get something almost as good. Getting a UAT is a joke, and 1300 Soldiery is not that difficult to amass, as most people have all the sol gear they want for their main jobs (I have my tanks and my monk fully Sol geared aside from the few pieces of HA I have, screw coil RNG but that's another story).
If the Relic weapon gave you anything aside from a marginally better weapon than you can get by doing ST and Hullbreaker Isle, it would be a different story. For instance, if I could link a MNK Nexus to my hot bar and activate it once every 2.5 minutes for a 15 second 2x magnification of my current stance (FoF, FoW, FoE), I'd grind it, because that would be something that I cannot get anywhere else. Or a 15 second 700% increase to MND on my PLD every 3 minutes so I could use Cure for a few seconds effectively. As it stands, if you are an extreme min/maxer, willing to spend a butt-load of time, or a butt-load of gil, you can get a...iunno 1.5% increase in your DPS by getting your Nexus weap over your HA? Or Novus over unweathered?
Its just not a good time : reward ratio.