At least there were options that were grouped in a sane fashion and discoverable while I was in a particular screen trying to grope around to find a setting tha

At least there were options that were grouped in a sane fashion and discoverable while I was in a particular screen trying to grope around to find a setting that I needed to change. about:config is not discoverable in any way, shape, or form and we've lost the ability to discover capabilities that you don't look for in particular via a broader search. The ability to find something in passing that is related to your mission has severely diminished.