> The only annoying and inexplicable thing is that some apps run their own background process for push notifications, rather than using GCM, so pushes stop comi

> The only annoying and inexplicable thing is that some apps run their own background process for push notifications, rather than using GCM, so pushes stop coming in if you kill those. There are valid reasons for this, e.g., if you want your app to work on Android devices without the proprietary Google applications.