To rephrase, I'm not saying this isn't a historical milestone. Though since you're leaning quite heavily on this, I'll add that printed word is probably a bigger deal than most of the things you mentioned, even if it doesn't have the ring of space flight or nuclear fission. But, this is not what I meant to discuss.
To come back to my point, the astronauts were singled out and idolized and that didn't have a bearing on reality. If today someone were to muster modern science into an astounding vehicle of marvelous engineering and ambition, and it would require a human technician to operate, and let's say I would be that technician, you wouldn't say that I'm a hero or a person of extreme merit, because I would be just a technician.
Enter framing. If I would operate the device or vehicle on some interesting journey, and I would then go off to shake hands with some politicians, and there was some incentive for the media apparatus to spin this in some simplistic, easily graspable way, they would have everything they needed, and I'd become a vivid symbol of that marvelous flowering of our civilization (or of US, given the Cold War context).
Will you ask the casual observer to grasp the grandiose complexity of what led to this event, or will you just give him a pawn-head in the form of an astronaut and say "idolize him", thus letting him confuse a flashy front-man for the real thing?