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7 Common Linux Myths You Should Stop Believing
(www.howtogeek.com)
From Wikipedia, the free encyclopedia
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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Why does your brother use NixOS in the first place?
Don't get me wrong; I think NixOS is a very interesting project with a very bright future. It probably wouldn't be an exaggeration if I said that NixOS has single-handedly inspired the current immutable revolution. However, it's also a distro that wants you to learn and digest its ways before it will return the favor.
But, based on my reading/understanding of your comment, your brother doesn't strike me as a seasoned Linux user. Am I right? Btw, NixOS is hard unbeknownst of how many experiences you got with other distros. However, I would simply never recommend a new user to use (Gentoo, Guix System or) NixOS. There are definitely outliers, but they would have to find it themselves then.