I am a Linux user, but I don't really know how most things work, even after years of casual use on my Main, I just started getting into Devuan and wondered then, what exacly does systemd do that most distros have it? What even is init freedom? And why should I care?
Linux is based on unix, which was an operating system designed to run on computers like the PDP-11 of the 1970s.
The problem is that computers have changed a lot, and Richie and Thompson couldn't perfectly forecast all those changes. Most notably, it predates the internet.