I don't want to derail the thread but I guess I have to write something....I suppose but I'm still baffled by the idea of harm.
I'm one of those viewers I described earlier, once you've seen it you can't unsee it.
For example if I had watched PIC and seen deaths of many characters from TNG episodes, they just might pop into my head while watching an older episode I have loved for many years. I don't want to experience that.
Another example: Elizabeth Shelby barely escaped the Borg attack with our crew. There's no need to see her killed in PIC. Basically that's just shock value. We are (most likely) all going to die eventually but I would like to keep her alive in my head. We didn't see her birth, why watch her get killed for no reason. That is the harm, watching an episode written decades later by someone else who had nothing to do with certain character or the original story and people just start dropping. No thanks.