The second question was "Where is this git-time-machine equivalent?" which is easier to answer when one knows what a user is expected to accomplish by using it, specifically the graphical part.
I think the Atom developers are doing the right thing now by focusing on performance more than useless graphics. Right now I recommend vscode to other people even though I'll probably always use emacs myself.
I don't know on the actual charts, as I just don't use that sort of thing. Seeing anything git related and I think magit. Pretty much period. That is, I didn't see the chart.
You can do graphics in emacs, though. I typically just use it to show email and inline images for org-mode.
Calling it "web 1.0" seems amusingly critical. That said, taking it back to the question at hand, there doesn't seem to be a technical reason you can't do the images in the time machine thing. Most of my emails in gnus show graphically in a correct way. (Some of the more heavily formatted ones mess up, but usually not terribly so.)
For a better idea of what it can look like, enable LaTeX previewing inline in a buffer. Again, I'm usually in an org-mode buffer. And I confess I probably can't fight off a "web 1.0" argument. I have not gone for more modern UIs for some time. :( I grant it is a preference, but helm and similar UIs are much preferrable to me over what I typically see in the newer apps.
