The purpose of tools is to assist the ones who operate them, not to control the operator. Unfortunately, some of us have forgotten that.
For example, do you feel compelled to answer your cell phone every time it rings? Don't you get tired of seeing people answer their phone when you are trying to talk to them? It says to us that anyone who happens to call is more important than we are.
What about e-mail and text messages? Do you feel duty-bound to respond immediately?
Tools are a good thing, but we should use them rather than be used by them.