It depends upon the need of a particular service for daily use. On Windows Phone, the apps which we regularly use like Facebook, Amazon,etc. are in a very bad condition. It's not that developers from Amazon or Google don't have potential to make apps for Windows Phone, they are simply not interested in developing for Windows Phone for many reasons.
According to me, if a developer has the potential to make his/her service available for a platform, then he should offer his/her best to keep customers happy. He/she should not think whether a customer uses a Windows Phone, iPhone or Android and give equal service to the customers regardless of the platform they rely on.
It depends upon the need of a particular service for daily use. On Windows Phone, the apps which we regularly use like Facebook, Amazon,etc. are in a very bad condition. It's not that developers from Amazon or Google don't have potential to make apps for Windows Phone, they are simply not interested in developing for Windows Phone for many reasons.
According to me, if a developer has the potential to make his/her service available for a platform, then he should offer his/her best to keep customers happy. He/she should not think whether a customer uses a Windows Phone, iPhone or Android and give equal service to the customers regardless of the platform they rely on.
End users should be able to work with all those apps only it meets quality. It is very difficult to answer this question.
Quality of apps are matters also for Windows platform as otherwise user will start leaving from the platform