[dadoum]

> Programs aren't even allowd to set their own icon

In GNOME. There is a protocol to set your window icon, and it will be respected by the Wayland compositors which are considering that there is value at having custom icons for each window. GNOME also considers it's confusing to have multiple windows from the same program with different icons, especially since the only places those icons could be displayed on GNOME are in the dock and in the Alt+Tab menu, but you pin apps to the dock, so those custom icons cannot be displayed there when there are multiple windows from the same app.