After a couple hours of using xaml I felt like I learned something. But I didn't spend more time on it.

I've developed apps using XAML for a considerable amount of hours. XAML is significantly more restrictive than CSS. Windows UI toolkits will give you a bunch of pretty high level components, but the primitives for build anything else are extremely poor. It lacks something like flexbox or grid.

Last time I investigated having a uniform grid of items is impossible without falling back to custom C# layout code.