If you treat emails with the same urgency you give phone calls, I would argue there's a fault in your phone/communication set up. For most people I know, email can wait an hour or two, or even overnight. Phone calls require you to choose to ignore them.
Until the FCC develops redevelops any sort of interest in dealing with scammers, my phone is basically useless for most of the world to speak to me.
If you're trying to reach me and are not on my list of approved callers, you can email me, or decide you didn't actually want to talk to me. (No, I don't use FB Messenger or related spyware, either.)
On the other hand, I apparently pay much more attention to email than you - I generally respond within about five minutes, assuming there's some reason.
One of the points of email is that it is asynchronous communication. You can even respond in batches like RMS does. While everyone's email workflow is different, it would be a mistake to assume that email was ever designed to be used as an instant-messaging-style communication tool.
