The tray icon dock/panel in KDE is fully removable. You can just delete it. So the opposite of that is also a thing. No one is forcing you to always have a visual presence of a program. Even Windows let's you hide tray icons forever if you want.
All these issues can happen in any platform, Linux is just the more annoying/unpredictable one, with GNOME taking the cake for being so obtuse. There is either a carelessness from the developer or the ad-hoc nature of those "tray icon" systems is to blame.
Can you name some that act like this? In 30 years I don't think I've ever seen that behavior...