Figuring that the Nazis could leave Poland alone is a big stretch. Hitler wanted those lands back that were once German and was even willing to go in with the Soviets to do that.
But just for the sake of argument, assuming he did not attack Poland and perhaps allied with them it would have made a huge difference to the intelligence gathering abilities of the Western Allies. Cracking the German codes was based on Polish research. They gave the key to the cracking of Enigma to British Intelligence.
Just the same, Poland would have had to make huge donations of territory and take on a Nazi atmosphere to placate Nazi Germany, as well as participation in “The Final Solution” once it was thought up. It would have been just as ugly a proposition as its conquest.
There is little good one can find about the Nazis. The best thing may have been their invasion of Poland which put an end to appeasement.
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