Admitting to not knowing everything is an act of humility that not everyone is capable of, especially in this age of arrogance.
And the 'body horror scene' isn't the baby alien coming out of the dudes' chest, is the baby coming out of the mommy's womb.
I was thinking "It's such an '80s movie, I don't know if they can pull it off" and it's kinda what you said: it's so much based on what was futuristic for those years, and now it's all different.
Just a stray bullet... a leftover landmine...