Third parties eventually found a way to override it in XI--maybe one day someone will figure it out for XIV if SE never does anything about it.

While we wait, can try going into driver settings and toggling Negative LOD Bias to Clamp instead of Allow. Haven't fiddled with it myself yet, so don't know if it will be noticeable. In theory, if XIV is using negative bias by default it may have an impact on the background texture qualities (and maybe performance). The question will be how bad it looks if it reduces the quality--some reported tweaking bias too much in XI made the textures kind of "muddy" on some systems.