Considering that all the NM key items you're arguing they need to add have multiple sources for their acquisition (the NM itself or through sturdy pyxis farming), there's really no need to add additional question marks or additional copies of those NMs. Empyrean weapon farming for the most part is insanely easy already, given how readily it is for people to get the required KI for popping their NMs, there's no need to make it even moreso.

The only thing as far as Empyrean weapons they should consider adjusting is Fistule, since that still has the same single timed spawn its had since its inception. All the others though are easy enough as they are.