Xerox never made the Macintosh because they missed key innovations such as regions, the Finder, consistent UI guidelines, the ability to put a usable GUI OS in an affordable package.
Doesn't matter what PARC's limitations were, what matters was the Macintosh was a huge innovation that created what the Xerox Alto and Star were missing.
Xerox never made the Macintosh because they missed key innovations such as regions, the Finder, consistent UI guidelines, the ability to put a usable GUI OS in an affordable package.