For example: I can share a file/folder from my mobile phone Drive app, and get a link for this. I can even look at the shared files in the dedicated section 'Shared' and flick between 'Shared with me' and 'Shared by me'. Why can't the latter also be part of the desktop app? It would save me a lot of time.

Also, 'Create document' would be great in the desktop Drive app, even if it opens my desktop browser to do so, but a dedicated document app would be fantastic!