First, the video perspective is absolute shit, someone narrating
over a black screen would be a better choice, but it seems you
like your face a bit too much. If I understood the argument, it
boils down to Emacs is great because it is extensible in Lisp
which is a high level language.
Well that's true, though I can't say if it is better than vim
script because I never used it before. I know how to use vim
really well, but I decided to go full Emacs because ORG, TRAMP
and many other modes that make my life easier and my time better
used.
The analogy of attaching stuff to a hammer to Unix tools, again
if I understood correctly, is invalid because Unix tools use a
common interface, that's text over standard input, output and
error, not building something on top of another.