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Linux Mint looks to fork more GNOME Apps because of libAdwaita
(blog.linuxmint.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.
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Linux has never had UI consistency. If you came to it during a brief period of time when a select subset of software that you used seemed to share some consistency, that's was coincidental.
I don't think it's necessarily a bad thing. Software should be in constant flux and evolving. As part of that alternatives constantly compete and on Linux all the upheaval is done in the open.
Gtk and QT weren't consistent but there was a Gtk style that used QT as a rendering backend, which allowed you to get some semblance of consistency. Then they came up with Adwaita, which doesn't really allow that anymore.