By the same token by consistantly "grandfathering" in old RME users, new content, which is balanced around NQ weapons, will invariably be 'easy', especially as more and more of the player base obtains RME's. Old players with RME will become bored because their RME make content too easy. It's a hard thing to balance. Should RME continue to be 'grandfathered in' as the ultimate weapons so new players only have to strive for body equpiment and accessories? If so, new content will continue to be easy because those weapons are already quite powerful.
I think what SE is trying to do is not nerf the weapons but introduce other weapons which are on par, that other players can obtain more easily than RME and then balance the content around the new weapons(which are more or less on par with RME). So they want to smooth out any large gaps that RME create by reducing the gap, and leave RME with a small but discernable boon over NQ. For example, Durabdala is great, and Terpander gives 3 songs which reduces the gap between 2 and 3 song bards, but Durabdala at 99 will have an extra song and higher duration. They balanced older weapon skills to be more or less on par with Relic and Mythic Weapon skills so that other jobs with NQ weapons can perform just as well. Certain unique traits of the weapons will never fully be given to NQ weapon owners, for example Coronach's low enmity or Yagrush's AoE -na, however they have made strides to reduce the gap with things like Divine Benison proc on Divine Seal and Decoy Shot.
Also as a model, you don't really want to encourage players to be doing old, outdated content, for the best equipment and I don't see them adjusting the special unique traits of RME anymore but rather encourage players to see the newer equipment which can be competitive(except for Koga,Annihilator/Yoichi,Ryuno,Carwen,Burtgang,Yagrush, Nirvana, for obvious reasons) those weapons will likely never become obsolete simply due to the fact that they change those jobs' performance in a very drastic way. However they could implement weapons that even RME would use in certain situations. For example a weapon with +50-60acc could outperform a Mythic if the NM is extremely evasive and boasts high base dmg or if a new class of weapons comes out with high +acc/att and extremely high powered and unique weapon skills(but won't have aftermath for example)
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