This was extremely informative and a wonderful video. I'm unfamiliar with the physics of these games as it's been upwards of a decade since playing my last Valve shooter, and this was tremendously helpful in understanding it better. Admittedly, I am dumb as fuck and it's late as I'm writing this so the video was way too fast for me to absorb a lot of information, but it'll certainly be bookmarked and rewatched.
PS the Viscous outplays at 12 min were legit inspiring to watch lol