Once upon a time, computers weren't all constantly connected to the intertubes. What we call "air-gapped" these days was the normal state of machines back in the desktop beige box days.
Back then, when you bought a program it came in a cardboard box on physical media. You would install it on your computer and it would work the same way from the day you installed it to the day you stopped using it. Nobody could rearrange the menus on WordPerfect or change the buttons in Secret Weapons of the Lufwaffe... Good times.
Nowadays, half the software you interact with doesn't even reside on your PC. Further, there are whole departments at, say, Facebook or Blizzard or Google whose entire job is to "enhance the user experience". If they're not constantly dicking around, adding and removing features, changing what buttons do, moving things around...then they're not doing their jobs.
We have incentivized instability.
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