You may have misunderstood me. My point is, I don't see life as meaningless, which is why it would be hard for me emotionally. No doubt people will realize this, and end up avoiding social situations at the risk that they're new friends are going to die.
No, I didn't misunderstand. I was just commenting on your usage of the word 'grief' to describe that feeling of loss. To me, that word seems far too inadequate to describe that scenario. But like I said, we probably can't even imagine what that would be like because this is such a hypothetical situation. I totally agree with the rest of what you said.