You can do the same thing twice, and you can also lose the ability to do something.
The ability to do the thing is what is really being maintained and demonstrated.
Every country has the technology to go to the moon - it's well established now. But who can actually make it happen? That's a huge organizational, human, financial, industrial challenge. And people do notice when only one country can do it.
>But who can actually make it happen? That's a huge organizational, human, financial, industrial challenge. And people do notice when only one country can do it.
On the other side of the coin, it's such a huge expense just for bragging rights, that for any country it's not worth undertaking. It's much more preferable to just give the appearance that you could totally do it if you wanted to, but you just don't feel like it. I'd argue that the US is currently failing at this, but until anyone else flies a manned mission to the moon, it doesn't say anything.