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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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There is something sinister about his vision. I think it is fine for server OS to all be identical (docker is that already) - probably what you want, although less flexible. But for personal computing… that makes it very impersonal, to force bit-to-bit conformance on people.
This is not what this is about. You can customize it without problem, see Steam Deck. Its about the core system files being read only and easy to upgrade.