Good points.
Our reserving the right of first use during the Cold War was to deter the Soviets from using their overwhelming conventional superiority in Europe.
Since that superiority no longer exists and the Russian army is not presently capable of launching an invasion of Western Europe, I’m having difficulty thinking of a scenario in which first use of nukes would be appropriate.
Good points.
Also, we used the threat of nukes to keep Saddam from using chemical/nerve gas on our troops during Gulf War I.