I feel the ability to close apps that are running by right-clicking on its desktop icon and clicking a ‘Close’ option in the context menu
I started Steam by accident and thought “why do I need to move my mouse elsewhere to exit it asap?”
Welcome to the community, milkii! It’s great to have you sharing your first brainstorm here.
Regarding Steam, it stays active in the system tray by design (just like it does on Windows and MacOS), which is why it keeps running in the background. You have to right click the tray icon and then select Exit Steam.
KDE Plasma handles process management (like closing apps) through the Task Manager—both the ‘Icons-only’ and standard versions have ‘Close’ options in their right-click menus. This is exactly how it is done on Windows and MacOS as well.
Desktop icons are traditionally treated as static shortcuts rather than active window managers, but it’s an interesting idea for workflow efficiency!