Agree with look out. To locate a position given relative to VOR will often take time looking at a map, paper or electronic.
Disagree with knowing every possible reporting point in preplanning for a long VFR flight into a densely inhabited area, especially with changing plan to avoid weather.
Pessimistic on lookout though. I was given an aircraft 3 miles and 500' distant by radar, and altered my course and height, saying what I was doing. We were both on radio, same frequency. But with low sun and haze visibility into the sun was poor, though good in every other direction. I never saw it.
I was lucky to get a warning from ATC in the US as I descended a C172 in ignorant formation below a Pa28, excellent visibility, and no other traffic near.