I want to advocate for more use of the Messaging app in the JT Alert companion program for WSJT-X.
Right now, I'm watching 4X4ZP on 30 meters with a workable -15 dB signal into North America at 0120 UTC. I'd love to let him know he's being heard in Texas, but he's Offline on JT Alert.
The Messaging app in JT Alert also gives you the opportunity to exchange some of those personal comments that might occur in a CW contact.
Certainly, I do NOT advocate for using JT Alert messaging to complete a contact - all information to complete a QSO should be passed in WSJT-X.
However, I see nothing wrong with a "You're in the log" message sent to those who insist on sending "RR73" multiple times during a contact.

73 de Tim, WA5MD