XAML is the only thing I was ever able to write a complex layout in, run the app, and see it look exactly as what I intended on the first attempt. That would meet my definition of productivity.
For example, my experience with CSS has been the opposite of that. F5 a million times before the layout works the way I want it to. Sometimes even googling how to do create some type of layout because I can't think of it on my own.
React, Vue, Svelte as well as Flutter & SwiftUI all implement different but vastly more productive reactive dev models.
MAUI will not be resurrecting .NET Desktop Apps which have been on decline since WPF. Blazor Desktop Apps might, anything XAML won’t.