I liked seeing the examples of creating a calculator in HyperCard, but I don’t think that Steve Jobs killed it because it was some existential threat to Apple’s profits. Apple gives away its software for free when you buy a Mac, and to my knowledge they don’t make a large fraction of money on selling software licenses. It’s also completely possible to run your own code today on a Mac, so we would have to believe that…
I see it as not-invented-here. He was in love with NeXT Step because it was his. The Apple ][ shipped with BASIC. Apple was not founded on letting you consume your computer. But the world had changed since the 1970's and there was a software ecosystem. Hypercard would seem to have brought programming to the masses. But by then there was a broad base of software companies that would provide users the calculator app, e…
Famously, when he returned to Apple, he used NeXTSTEP/OpenStep instead of a Mac until Mac OS X 10.1 came out and it was stable enough for production use. I can't find the article, but someone received an email from him around 2000 where the headers said NeXTMail.