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GTK's X11 Backend Now Deprecated, Planned For Removal In GTK 5
(www.phoronix.com)
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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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
A lot of the non-GNOME GTK desktops have elected to stick with GTK3. They even maintain a suite of applications (Xapps) that many of them share.
GTK 4 and higher are increasingly GNOME only (not that you cannot run them elsewhere—they just won’t fit in).