Very simply because the 14-day plan you are referring to was an emergency contingency that was predicated on a NATO nuclear attack on Poland. The idea at that point was to go for broke because there was little chance of getting reinforcement due to a massive belt of radiation in Eastern Europe. This was only one of many scenarios, and the reason why they were not implemented was that none of the preconditions of these SHTF scenarios were fulfilled. Poland never got blown up in a nuclear first strike; hence the retaliation plan was never relevant.

I'm not sure if it's kosher to link here, but there a few veterans on that armchairgeneral forum who saw the standoff on the other side at the height of the Cold War, and they were privy to some equally fantastical plans. One of the guys JAGDPANTHER88, apparently, was an engineer responsible for planting atomic mines to blow up and irradiate key regions of Germany if NATO failed to stop the invasion at the border. That was a moral dilemma that eventually caused him to exit the service.

The short answer to why none of these scenarios came to pass is that cooler heads on both sides didn't want to start the apocalypse.