"Do you actually think that HTML, CSS and Javascript are good technologies to build applications on top" Are you serious? I am not saying "the web" is perfect, but this just nonsense.
Unfortunately, the XAML everywhere people lost at Microsoft, so we're stuck with half-baked, kludgy and limited solutions like atom/electron/node-webkit for building cross platform desktop apps. XAML everywhere (Silverlight) is so much more precise and it's compiled. I would have preferred that they continued developing Silverlight at least as a means of building cross platform desktop apps, but I understand why they don't want to expend the energy.