This is a really interesting and insightful comment! I'd add WWI/WWII to your examples- the French were so used to entrenched warfare they poured all their efforts into the Maginot Line because fortifications and prepared positions were the thing to do... only to be trounced with the mobility and swiftness of blitzkrieg.

Also imo USA & the UN let Rwanda genocide happen because they were gunshy after Black Hawk Down in Mogadishu thus everyone was so reluctant to commit forces even though even limited intervention early on could have stopped hundreds of thousands of atrocities. The overreaction to Somalia paralyzed effective action anywhere else.