The idea of online only software irritates me. Of course multiplayer games have to work this way. When blizzard and Ubisoft started requiring an active connection for single player games that was just going too far.
Can you imagine sitting at your computer, doing literally anything. The screen goes strait to blue with the windows shutting down screen saying, "Internet disrupted, please contact your provider for support".
Never mind flaky internet, what about people that do events?
Things like PowerPoint presentation machines, VJ systems, video servers (for massive multiscreen playback).
You can't go into a field for a festival and expect reliable internet.
You can't go into a theatre and expect reliable internet, especially when 3k+ people turn up.
There are a few systems that run OSX, but Apple's hardware doesn't give you as much control as something like an Nvidia Quadro with sync cards. 99% of the big shows will be ran from Windows OS
ChromeOS is just a regular OS. Without internet, everything continues to work that was designed to work. It's about the same as Windows that way.
However, Chromebooks have planned obsolescence, and most devices lose official OS updates after some number of years, with many having weird hardware that makes it difficult to move to another operating system.