Earlier quoted context omitted.
If you are trying to understand three-dimensional functions, it makes sense to view them in 3D. I was just pointing out that in the domain of information visualization (separate from math and scientific visualization), 2D is generally preferred for perceptual reasons.
... that's kind of why I made it a point to mention d3.js and heap lavish amounts of praise on it in the article. Which you read, right?
Indeed, thank you! Hugs all around. :) You made the argument that D3 doesn't do 3D because of the DOM, and I just wanted to clarify that while this is mostly true (caveat custom elements such as X3DOM), the reason is perceptual as much as technical.