Alexander the Great did the ancient world equivalent of flying to Jupiter and setting up a colony on Europa with modern technology. That's doing something.
Superman has been enticing intergalactic dickwads to come to Earth constantly to test their mettle against a freakshow that has been playing boy scout for 2 decades of his life. He doesn't have the right to fuck up the most important steps in human history. Hell, the history of all life on earth, for that matter.
25,000 years from now, in whatever way human language evolves and in whatever way we choose to move society and culture, there will still be a translation and pronunciation for the name Neil Armstrong in academic circles. Think about that, how fucking incredible that is compared to some dude who plays the role of a glorified first responder.