Like everything on the web, there's multiple flavours, yet we're told it's "one platform". But here goes. I think you missed :
1) android
https://developer.chrome.com/multidevice/android/installtoho...
2) ios
http://stackoverflow.com/questions/17306806/how-can-you-give...
They go to the app store to get apps. They don't open a browser and google for a web page and expect it to operate like an app. Also you need to have an internet connection to even use an app, who wants that.
Technology improves but the drag comes from user adoption. You'll need to change behaviour.