A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
You "believe"? What are the exact limits of file sizes opening in the browser? This could be a deal breaker for many companies.
"The best user experience is to quick edit small Office files in Office Online, sync the larger files locally and modify them using Office client. "
No, that's the WORST user experience. First, syncing is generally regarded as a disaster in Sharepoint. And why would I pay for online storage if I have to sync things and keep a local copy? If that's required, why do I need the cloud? You guys have to start getting this thing to work the way you promise, or it's not going to have much of a future.