I think his point is that browsing to their website, it's not entirely obvious how to quickly share a file. When you initially go to sendoid.com, their link to share a file is the most prominent element on the page.

Having the native hook into context menus is great in the file system, but if your users can't even install the app, what's the point? Having a dead simple browser experience is easier for users because it's one less step to do what they want to do - share files.