Have I been asked? Yes. Am I prepared with references just in case? Yes, though to my knowledge none have actually spoken to the references. Tax clients are simple to obtain, but still not my focus--I want the 5 figure controllership contracts, and that is where they typically want references, particularly if they were not referred to you by an existing client.
I have very good relationships with my clients. Still, it is difficult to get clients to commit to being willing to speak with prospective clients, or to write testimonials. And yes, the scope of the reference is strictly concerning quality of my work and effectiveness with communication.
I WILL follow confidentiality requirements concerning sensitive information, but I am not going to take it so far as to not reveal client names or services provided. If one has to do that, I assume they are afraid of competition and/or have a big mouth in discussing sensitive information under the veil of confidentiality by not revealing client name, which is nonsense. I have nothing to hide, embrace competitiveness, and I certainly am not afraid of another firm swooping in and stealing my clients. Honestly, I live in a small area--not difficult to find out which CPA serves any given person or business. But if the prospective client wants to see anything I cannot release or disclose, not going to happen.