Never be obsessed with radio-arranged separation when in VMC,
I can imagine pilots becoming complacent about visual lookouts but I can’t imagine someone becoming obsessed with radio arranged separation. What makes you think this is a problem Dick?
Scanning for traffic in the most likely places is a skill that can be developed, no doubt about that, and probably a good idea to draw attention to it every now and again because unlike at the aero clubs and flying schools, it is rarely mentioned in Airline/RPT training.