I sympathize with your sentiment, but just want to point out that I think the PUC is how they justify calling it "4D". Not that it makes much more sense, but I guess the idea is they're not only stacking layers of NAND, but also putting the controller underneath it all. So, that extra degree of stacking somehow qualifies it as "4D"."4D NAND"???
Let's not get ahead of ourselves, just because someone does 238 layers of what initially started as SLC, and evolved to DLC, TLC and now MLC.
MLC nand, be it 3D or regular, can have a very large amount of layers. To become 4D nand, it'd have to shape shift in our realm, and I don't see that happening anytime soon.