If you deny that the app gap exists, it's hard to have a serious conversation.
I agree that there is a gap in terms on numbers or may be some recently launched chatting app in your country[which will eventually come to Windows phones like many others], but I find all the apps for my day to day usage on Windows and my friends on Android also use the same apps that I use and so I don't think that the difference in numbers of apps affect me that much.