The TSB report quite clearly indicated the aircraft were in each others' blind spot: you appear not to understand, but by definition that means they were unable to see each other.
Moving along, I'm not sure that anybody questions the importance of maintaining a good lookout, and I'm even less clear what staring at pretty glass panels has to do with this particular accident. Unless, of course, you were on board for the collision and somehow miraculously survived to come on here and lecture us about it (which I doubt is the case)...