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You're missing it... Web Assembly would allow devs to build apps without any html or javascript or css. The UI construct could be WPF/XAML or even WinForms like tech or something new. Scripting and CSS would be entirely unnecessary. A lot of businesses would love nothing better than to dump the Jedi-like skills of the scripting developers and trade that for mundane forms skills.
you appear to be missing the fact that there is no widespread desire by web developers or businesses to convert their webdev stack to an application development stack. HTML, javascript and CSS are easier than C, C++ or Rust. Writing a website in HTML/CSS/JS and updating a website in HTML/CSS/JS are vastly simpler than writing a graphical application then rewriting and recompiling it. As with Flash, WebAssembly will b…
Qt, Delphi, WPF are miles ahead in terms of tooling in what a pile of HTML, CSS and JavaScript are capable of.
Anvil and tools like OutSystems are probably the one thing that comes close to what Blend is capable of.
Having a pixel perfect WYSIWYG GUI designer, with a components market, painless DB integration and deploying to the web at the press of a button will get lots of enterprise love.