It looks like an oversight that needs to be fixed. Caravan members are walking fairly close to each other to be in the area of effect of the person with a Psychic harmonizer implant and benefit from the mood buff.
It would make sense, yes. Thanks. For Cynapse.
I was 50/50 on this whether Tynan thought of this mechanic & its a bug/not working or whether it was never intended, thought of, and implemented which could be implemented in without changing anything. I guess it was the latter.
Fixed for the next build. Thanks for the report!