Some people says that "73" is required to complete QSO. But "WJST MANUAL" says that...
[If you have received RRR — that is, a definite acknowledgment of all of your information — the QSO is “officially” complete. However, the other station may not know this, so it is conventional to send 73s (or some other conversational information) to signify that you are done.]
So I will log when I receive or send "RRR" or "RR73".
Please remember SSB/CW DX pedition QSO. Do you need 73? We only exchange 59 or 599. In addition, sometimes thank you or TU.But that's not required either.
We don't send the actual signal report. Always 59 or 599. The QSO will be established if we can recognize each other's call sign and can make round-trip exchanges like ping-pong.
Of course, each person has a different way of thinking, so I do not push my opinions. But it would be great if you could get some hints from what this manual says, examples of DX pedition, etc.
de JP1LRT Yoshi