I remember printing out the Gentoo installation manual in the compsci lab way back in 2004. It was my first Linux distro and have fond memories of tinkering around on it. I remember leaving it a few years later for a cool new distro that was on the rise called Ubuntu. I still think portage is one of the better approaches to package management though.
I think point number three is likely what Deckwise is getting at. Every distro is stable when you don’t update it. I generally measure the stability of a distro on the ability to blindly update without taking out something mission critical.