Yeah but I’ve interacted with it a lot and most of my interaction is commands sent through one of their programs. Versus scripts like init.d whose contents I can easily inspect and modify. Init scripts aren’t config files, they’re directly executable code.
It used to be that everything in Linux was a file, ideally a text file, so if you could find the right file you could access or change what you wanted. Systemd is a big program that manages a bunch of stuff and creates unique commands within its programs for doing so, which moves away from that principle and turns system management into what feels a bit more microsofty (like the registry editor program vs editing config files, etc) and a lot of people don’t like that. But to its credit, it does solve a few problems with cobbling together a modern system that doesn’t suck.
Even then, a basic soap like Dr Bronners or your favorite “hand soap” does well for most of your body. People ask my wife how her hair is so amazing, she just washes it every couple days instead of every day and sometimes has some light argan oil or something to reduce frizz. Washing hair (especially long hair) every day damages it no matter what you’re doing. The most important thing is to scrub your scalp really good.