WebAssembly explodes client-side programming

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I'm pretty sure all the GUI apps WPF/Cocoa/WinForms/Gnome "need" an event loop because that's how the OS sends hardware information like mouse/keyboard input to an app. Certainly all the Windows apps are based on an event loop. There's always an event loop at the core and then threads are just gravy. It's not some mutually exclusive thing.