Always talk to who? In this case it was perhaps obvious but this is not often the case. A mid air near our strip involved 3 aircraft (one maneuvered to avoid another and was hit by a 3rd). All three aircraft were on a sensible frequency, one was on the micro frequency, operating near its home strip, another was on safety com operating near its different strip and the 3rd was talking to a local international airport. There were at least another two frequencies which would have been equally reasonable in that location (another international airport and a nearby licensed GA field) I talk if there is benefit, or if I am close to airspace, but there are often multiple chooses even then. Just talking in itself, can be of little to no value. I disappointing number of pilots think a basic service equals not having to look out of the window.
Rod1