As others have said, this only for a particularly hairy product called XPF, not Avalonia, so the price point is probably warranted, lol. Basically, they remimpl

As others have said, this only for a particularly hairy product called XPF, not Avalonia, so the price point is probably warranted, lol. Basically, they remimplemented WPF itself, the whole shebang as far as they could, to make a transition towards cross-platform support. Microsoft never even attempted this. It's for people mainly having a large, legacy WPF product so they probably already are a business and a desperate one at that to look at these fixes. But if you're making something from scratch, just use the free Avalonia. By the way, Avalonia also supports NativeAOT, unlike WPF, if used with the compiled bindings feature. Pretty cool!