There is a difference between “the app has a pretty UI to set something” and “this setting is configurable”.

One of the great things about the Mac is that there is always the option to defer certain advanced settings to the `defaults` program on the command line (or just things you want to make configurable but do not yet have time to extend the GUI). So if you want a somewhat-streamlined UI with just a few of the most common options, you can do that without completely sacrificing the ability to expose the rest somewhere else.