Yeah, I'm not going to read that to find the answer. IMHO one does not have to read back the freq unless they want silent conformation that they get the freq right. If they read it back wrong the controller has a chance to correct the pilot. Other than that who cares? If I'm transfered to tower, and it's busy, I'll just "roger tower g'day." I might not even use my call sign. 20,000 hours of this and I've never heard a complaint. I guess it's Okay.