Why email is a better virtual assistant

Now that virtual assistants are here, we need to decide where they live. Here's an idea: How about inside email?
The location of virtual assistants depends on which assistant you're using. Siri, for example, lives on the other side of your iPhone or iPad Home button -- or the Siri button on the new Apple TV remote.
For Cortana, it's inside the Windows 10 search box on the task bar or conjured up with the microphone icon. You'll also find Cortana through a voice command on Android and, soon, liv