Not sure what you mean by that? The UI/UX design of the System Preferences hasn't really changed since Snow Leopard imho. Cant speak to much about before Snow

Not sure what you mean by that? The UI/UX design of the System Preferences hasn't really changed since Snow Leopard imho. Cant speak to much about before Snow Leopard as that predates my personal experience. I'd love to get an example of what you mean?