Using the Sharepoint app on a Chromebook currently has the next disadvantages:
1. The fonts and images are being displayed with a factor 150% (?) and there is no way of tuning this
2. The bar on top of the window consumes almost 1.5 cms of the screen only to show the current page title
3. Navigating between sites is much more complex than in a web browser, since there are no shortcuts to favorite sites or to sites you're following