I don’t see the presence of another drone as a problem. You are responsible only for the drone you are flying, and situational awareness is what VLOS is all about. In the area that I live—a picturesque part of northern New South Wales (Australia)—it’s not uncommon to see several drones in the air at the same time, particularly during whale watching season. I have an Australian licence (RePL) and you cannot get one without passing a demanding CASA flight test as well as theory. Part of the flight training involved flying circuits with five other pilots around a regulation-size football field—a very good test of situational awareness!