Even in those that aren't, the duty to retreat applied only as long as it can be done in safety.
Nice in theory, but in practice, you'll get tangled up with the Money & Time-Sucking Kraken that is the Great Big Giant Large Crimnel Jesters Machine. Retreat to safety, I say.
I said, “it might be a good personal policy”. Responsible armed citizens should retreat if possible, if for no other reason than avoiding the mess you will get into if you shoot someone. But I was specifically addressing a claim that it was required.