Well ... XAML and friends did not fly into the web. That is what happened.
And the reason why the web feels clumsy, is because HTML is a document object model (for a floating and not paged document) and not a UI toolkit. And that will not really change. HTML made some moves to improve (like the flex display model) but still has not reached some of the core attributes of the WinForms or WPF layout models.
> HTML made some moves to improve (like the flex display model)...
Except that was CSS, not HTML. HTML is still just a representation of the DOM. Even the attempt at "semantic" elements (<section>, <article>, etc.) has basically failed, and been relegated to ARIA attributes. The "web" has settled on the trifecta of HTML for markup, CSS for layout, and JS for interactivity.
And the reason why the web feels clumsy, is because HTML is a document object model (for a floating and not paged document) and not a UI toolkit. And that will not really change. HTML made some moves to improve (like the flex display model) but still has not reached some of the core attributes of the WinForms or WPF layout models.