Originally Posted by
Bored at 3:00AM
There's very few elements of Superman that you absolutely NEED. You could ditch the costume, the undies, the cape, the Daily Planet, Lois, flying, and more and you could still have a pretty good version of Superman, but that version of the character is always going to feel a little under-cooked. Similarly, several good Spider-Man stories could be told without Uncle Ben dying, but they wouldn't be nearly as good. Batman could technically work with only one of his parents dying, too.
The Triangle Era proved that Superman could work with Ma & Pa Kent still puttering around Smallville, but the character works much better when all the formative elements established by Seigel & Shuster are intact. Keeping only Ma Kent alive gives readers and creators everything they would get from both, whereas keeping the death of Pa Kent intact gives Superman so much more emotional depth and pathos that he never possessed for most of the Post-Crisis era.