I would have liked a small piece of closure, say, one of the aliens at the TATV scene (as there was a Xindi Reptilian there) or the like. But it also does make sense - Archer did this, and it sits horribly with him, and then no one knows what happened, and you are forced to assume that those aliens lost their lives.
I agree re PTSD galloping through the crew. I write E2 stories with most of the crew suffering from clinical depression, and the drugs not always working, or people sometimes outright refusing treatment. I don't think that will go away.