You haven't read the article, eh? Pogue says: "Techie note: Popular conception has it that the space savings comes from removing all the code required by those

You haven't read the article, eh? Pogue says: "Techie note: Popular conception has it that the space savings comes from removing all the code required by those earlier chips. But that’s not true, according to Apple. Yes, that code is gone, but new 64-bit code, described below, easily replaces it. No, Apple says that the savings comes from “tightening up the screws,” compressing chunks of the system software and eliminating a huge stash of printer drivers. Now the system downloads printer drivers as needed, on demand."