aren't points 1, 2, 5 already in chrome, and have been for some times?
Re 1: You have to know to open the page (in the menu, or at chrome://downloads) -- by default it just shows you the download bar at the bottom of the page where you downloaded the file.
Re 2: Parent probably is confused by extensions versus web apps. I find this confusing too, since it's up to the developer to choose which form factor to use when writing the extension/app.
* Internal pages and tools as pages, specially the downloads manager (I can't stand Firefox's little windows or Chrome's behind-the-scenes crippled manager).
* How it handles extensions by default (little buttons to the right of the address bar).
* The nested Speed Dial and the Stash.
* Off road mode is a really great tool when using slow connections.
* Default synchronization (is not an extension).
On the other side, v 15 isn't as polished as it should had been before being made publicly available (CTRL+Z doesn't work, no bookmarks, small bugs with the address bar).
Anyway, as you can see, most of the benefits are just UI decisions. I just don't like how Firefox or Chrome look and how they display their functionality (which is absolutely subjective).