I use both. If I need a full diff, fugitive is great. Sometimes I just want to scan to see what lines I changed in a a file. In other words, it is impractical to use this plugin to find out what _files_ you've changed. It is great for finding out what lines in whatever file you've opened have changed.
No. You you do your thing. I'll do this. I don't want to have to run another command to see what lines have changed in my file. I want small, non-intrusive icons in the gutter without doing a damned thing.