The hurdle is that Europe tends to adopt things that are successful in the US, because it is convenient. Even most services and startups based in Europe are more or less copies of US products, with some notable exceptions of highly specialised applications. This unfortunate trend started in the 1970s, when the largest industrial players in Europe thought semiconductors were just a fad and consequently lost their competitive edge. It was seen as less risky to invest in commercially proven concepts than to actually innovate. This continues to bite us in the ass to this day.
As a (Plasma based) Kubuntu user I was wondering as well. Looks like they tried to emulate the gnome look and feel in the picture. In Kubuntu the default taskbar is at the bottom and the floating application bar doesn’t exist