The only items I have in that sharing menu are e-mail, which clearly there would be no need for this service if that were good enough, OneNote, which makes no sense, and advertisements for Store apps that I don't want to use. I think it's safe enough to say that menu does not replace a service like this.
The problem with that is Windows' lack of apps. The UX is better and will be consistent regardless of if you're sharing from an app, File Explorer, or file picker.
