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GNU 40th anniversary
(www.gnu.org)
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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I would dispute that the kernel is "the most important part of an OS." It certainly is an important part - but it does nothing by itself, and a user cannot do anything with it.
Anyway, the reason Hurd isn't a priority anymore is because we have Linux (well, more specifically, Linux-libre). There's no need to reinvent something that is already available in the free software world.
How I personally frame it is for the system to operate, linux is required. Sure its a dog shit os compared to modern expectations, but hey it operates