I hope that some major players are working on 3d audio tools to be worked into the metadata along side the 3d video
Absolutely it is industry standard to do offline edit, even when compositing.
...also, the assumption that the ram and hard drives cannot be upgraded is silly, as they do it on site at apple stores during repairs. As far as expandability goes, you may be missing the purpose of thunderbolt all together.
Do just a tiny amount of research, this is far more capable than the integrated graphics on older machines.
Can we talk about the sound design in this video though? It adds a massive level of immersion to the transitions.