I don't think it's necessarily a matter of having trust-worthy clients, at least not for me. It's the fact that Intuit is arbitrarily enforcing their interpretation of the EFIN requirements and not the factual meaning, which has been restated by the IRS numerous times.

I have a mailing address for a reason. I keep work separate from personal. I'd prefer to keep it that way. I've contacted 3 other software providers since posting this and they all agree and allow P.O. boxes. This seems completely arbitrary for Intuit to change at this time when no additional information has been released by the IRS to state it as a requirement.