In my opinion this is only true until the "unplanned" usage becomes mainstream. Language is always evolving. Once the majority is using the g sound from "gift" not "gin", the majority rule is correct, even though they would have been initially incorrect.

Consider the changes of people's names as they migrated around the world. In NZ, we pronounce Craig as "Crayg", in the US they pronounce it "Creg", which I struggle to make sense of, but that doesn't make it wrong. There are better examples than Craig but that was the first one that came to mind.