That's the thing - this is neither new nor just a "UI kit". This is a 30+ years old technology (see Be OS - https://en.wikipedia.org/wiki/BeOS and Haiku OS - https://www.haiku-os.org/ ) ! It is a full-fledged integrated Desktop offering. It has its own display server and does not use Xorg or Wayland. (As for the windows title, it can cover the whole window too - it's configurable). All the extra bells and whistles that we want (and do not want) will eventually come once the product is fully developed ... right now, they are working on porting it and ironing out all the bugs.