Sjeez BOAC,
Why always so cynical? You could use your tons and tons of experience to actually contribute your insights on here instead of flaming everybody!!
Indeed in JAA country most part A's say to have landing lights on below 10.000 ft. This is not written in stone! Descending into say, LHR and getting a hold with multiple airplanes above and below, it makes senses to turn them on earlier. Same for flying in the US where GA airplanes routinely fly VFR above 10.000', or some of the countries worldwide where ATC isn't what you come to expect in Northern Europe or the US or what ever.
Then you may also have a discussion about TCAS, which I'm sure didn't exist when you learned to fly and busier airspace which is relieved by modern navigation systems and more head down time to program stuff. Etc, etc.
Some people with low experience come on here to ask questions to genuinely improve their airmanship!!! Instead, you chase them away with your cynical remarks!!
Good on you!