Generally, your metaphors should not rely on comparison to a pretty traumatic event that has happened to quite a few people, many of whom might be around you without you knowing.
Just letting you know the reality that a lot of people view "stillborn" events as particularly traumatic. I'm not going to spend a lot of time arguing about this because it's a pretty simple point.
It's up to you to choose what kind of person you want to be, I don't have control over what you say.
I think the difference is that the term "Dead" is used in a lot of different contexts. E.g. Battery is dead. Stillborn is not, and it mainly associated used in one very traumatic context.
