Hmm. I would think there's a way of setting reasonable expectations for return calls. I would think a client that requires a same-day response ought to be paying a lot of money for that privilege.
I absolutely agree, setting expectations is key. But I can also see the point of needing the extra push to modify your own behavior. I don't have a TV. It died and I didn't get a new one. I have found new ways to watch TV, but now I cannot idle away hours in front of HGTV. It sounds ridiculous, but the few mouse clicks it takes to watch a program versus the single click of a button is all it took to create a difference between mindless and mindful behavior.
I'm in Italy, and it wasn't just family and work, but all kind of random people... People don't like to use email, here, so they call you for anything (like your bank, landlord, whatever).
Also, then don't trust email: the thing that annoyed me the most was that the rare times they chose email, they would also call me to let me know they had sent me an email, to make sure I'd read it...
Returning family calls, on the other hand...