I realize that Gentoo became a meme at some point, but it also seems that it might have transcended to the level of infrastructure. Thus, you rarely ever heard about it for the same reason you don't hear people talk about hammers -- it is doing its job running tens (hundreds?) of millions of chrome books among other things.

No flare, nothing fancy, it has solved a whole bunch of packaging, deployment, and environment control problems and gotten out of the way of its users (mostly ... chuckle), and it did it all with a pile of bash scripts and a little python here and there. Want to use systemd because you have a use case that would benefit from it? Go right ahead! The engineering work is done, no need for fights on the mailing list. Don't want to use systemd? `eudev` to the rescue! There are sound engineering reasons for not using systemd while also wanting to use some other (seemingly) completely unrelated piece of software that just happens to have a dependency on the kitchen sink.

Despite being a rolling release distribution, I find that the UX and workflows are more stable over long periods of time than any of the more popular LTS style distros. When I started fiddling with Ubuntu so that I could help my colleagues debug issues it took me an embarrassingly long time to realize that there isn't really such a thing as Ubuntu, just 14.04, 16.04, 18.04, etc. Each is some different form the other that stack overflow questions from one LTS are often simply wrong for another.

Writing this I wonder whether rolling release distros aren't effectively the original form of chaos engineering -- if everything is going to be changing all the time then it forces the developers to solve a different and perhaps more fundamental set of problems and ultimately leads to greater stability in the long run.