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GNOME and AppIndicator/system tray
(startrek.website)
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
The best and most official explanation I've read is the 2017 GNOME blog post, Status Icons and GNOME.
Essentially, tray icons are a throwback to the days before designated notification and media playback APIs, and they now create some ambiguity for app developers, in addition to being ripe for abuse.
It's a worthwhile read and the writer makes several valid points, but doesn't address as much as I'd like in terms of actual solutions for things like instant messengers.
Personally, I would be happy if most traditional tray apps could be displayed in the dash, with status indicators, and started in a minimized state, but I still see the benefit of having some always-visible panel icons, such as instant messengers and VPN indicators.