I know that's snark, but I just went and counted them anyway. There's at least 413 individual different settings in macOS Sierra's System Preferences, excluding Flash Player.
Yeah, that's a good reason to use it, and it makes sense that the tool is there. But there's a big difference between having a CLI tool for digging around when you need it, and having two separate GUI control panels with some settings in one, some in the other, and other settings in both.
Windows used to have something like that too, I think it was called the Control Panel.