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As you know, DNN is growing big and big but some components had been deprecated for a long time. However they are still remain there just compatibility issue. As for the new installation, it is not neccessary. For example, there are lots of navigation providers and we just need only one and would like to delete/uninstall them. Where to deal with this case? I know we can uninstall some ones in the exensions/providers section but no way for others, such as DNNDropDownNavigationProvider & ASP2MenuNavigationProvider. In my opinion, the core framework also provides some interface panel like the Html Editors. Thanks a lot.
And please refer to this wiki - http://www.dnnsoftware.com/wiki/Page/Navigation_Providers.