Also, Brendan Eich was inspired by Hypercard/talk as well when he was pushing out Javascript: https://twitter.com/search?q=%40brendaneich%2C+hypercard
Add that to the fact that Tim Berners-Lee was also inspired by Hypercard, I feel like the web that we have now really is a big, beefed-up, networked remanufacture of Hypercard.
Whenever I see a Myst screengrab I always think "Look, the Web!" Again, as a non-programmer, this is probably just some useless observation, but its inspirational and evocative to me nonetheless. It gets me musing that there are some uses for what we've got now that we're not seeing, and some folks should be exploring. For me, its storytelling, and I bet we could all do some pretty damn cool storytelling with the toolkit we're sitting on.
Perhaps Myst doesn't actually demonstrate a hidden value, but I always point to Hypercard and its friendliness & useability when smarter-than-me people tell me Javascript is crap. People I know from that era that were technically inquisitive tend to point to Hypercard and go: "Yeah! Hypercard was the shit!" or some variation of that.