Strange that the focus point of this article is rooting, you can modify your device to install custom firmware etc without needing root exploits anymore!
IMHO Android is not very free without root… I roll my eyes every time I see the need of adb commands when it is just way easier to slap in Magisk and have full control.
I come from iOS and I used to jailbreak the heck out of my devices, rooting is very similar to JB (but better).
I mean, literally replacing your device’s firmware sounds like a step above rooting, even if it’s arguably easier to do.