...which still seems barely cold at all if you lived for more than 30 years.

Not sure what you're talking about, Flatpak runtimes are easy to find and contribute to: https://docs.flatpak.org/en/latest/available-runtimes.html

I wasn't directly involved, but the company I worked for has created its own set of runtimes too and I haven't heard any excessive complaints on internal chats, so I don't think it's as arcane as you make it sound either.

Non-glibc distros (musl, uclibc...) with package managers have been a thing for ages already.

I fully agree regarding gamma, but completely disagree when it comes to debayering. Unless you turn 2x2 Bayer blocks into a single RGB pixel (losing some data in the process), the point of debayering is to interpolate missing data - it's upscaling of a kind after all - and you can use a multitude of various approaches to do that resulting in differing outputs.

It's just a common default choice to represent spacial data that lacks any context on how to interpret the values chromatically. You could very well use a heatmap-like color scheme instead.

I don't think that's correct. It's not "all video" - you can easily encode video without chroma subsampling - and it's not because this is how analog TV worked, but rather for the same reason why analog TV worked this way, which is the fact that it lets you encode significantly less data with barely noticeable quality loss. JPEGs do the same thing.

It's a very crude method, with modern codecs I would be very surprised if you didn't get a better image just encoding the chroma at a lower bitrate.

With 1:1:1 the matrix isn't square, and if you have to double one of the channels for practical purposes then the green one is the obvious pick as it's the most beneficial in increasing the image quality cause it's increasing the spatial resolution where our eyes can actually notice it.

Grab a random photo and blur its blue channel out a bit. You probably won't notice much difference aside of some slight discoloration. Then try the same with the green channel.

Eyes aren't all equal. Our trichromacy is fairly rare in the world of animals.

You do need to rescale the values as the first step, but not exactly the described way (you need to subtract the data pedestal in order to get linear values).

How does the DE figure take canceled trains into account?