Yes I think serious practice is needed. There is something else that is a disadvantage: you need anyway to review your lecture notes; but since they are so beautiful you do not easily see mistakes; one way to avoid overly beautiful notes is to use a kind of draft font that deliberately looks a bit off. The drawings (with the keyholes ) are of path integrals with holomorphic functions (something I did around 1982)
But the whole idea and execution are phenomenal.
My feeling is that using emacs it could be possibly easier but I will not try to convert a vimmer
Yes No multimedia programs, cause I am a mathematician and for pdf I use pdftools; so no Adobe also; started with Slackware in 2007 after an abysmal windows period from 1991 till 2007; now I use openbsd and emacs simply rocks and is rock solid on openbsd.
So how many of these 2000sampled families are actually on-line or have proper internet connections? How is this distributed across the country? How many have proper jobs? Are unemployed ? How does it match to the age distribution among all inhabitants? And why would 200 $ be a right cut-off for income?
Very impressive.
The first displayed text page contains a typo at the bottom :
CHAUCHY iso CAUCHY.
As others have said physically rewriting is part of comprehension (as is rewriting new words learned in a new language)
As the lecture notes are drafts from the black board I suggest using a font that does not make it look like perfectly printed. You can fool yourself believing what you wrote because it looks so pretty.
If you are writing a considerable amount of latex his setup is really cool. I will you these ideas but using emacs in stead of vim.
Wonderful job!!