Except it doesn't really work that way. I'm texting in WhatsApp when I get an email. I open the email from the notification area, read it, hit back, it exits to

Except it doesn't really work that way. I'm texting in WhatsApp when I get an email. I open the email from the notification area, read it, hit back, it exits to the home screen and not WhatsApp. When I already have a home button, why should the back button be used more for home (besides the actions in the app) rather than "up" a level to a previous state like it's supposed to?