I think one of the non-explicit lessons is that you have to prepare for the wars you might have to fight not only the wars you wish to fight.
No doubt and absolutely the hardest lesson for most militaries to learn--very much in line with the old saw, "preparing for the last war."

The others are also on target; I was just struck by the techno/precision fires issue as it plays out inside the IDF after watching them for so many years.

Tom