> Why didn't anyone ever do this?

They did! Back when there were Mac OS X install discs, in the 2000s, every Mac came with the Xcode developer tools on disc as an optional install.

That's the only reason I'm a programmer today. So I would say that in an important sense, the Mac did bring programing to the people. And back in those days, there seemed to be a lot more amateur Mac developers than there are now (and possibly more professional Mac developers too).