basically this comes down to time and money. if you’re a hobbyist, you have lots of options available, but they take time to learn and you probably already know html. if you’re a professional, developer time is more expensive than cpu cycles and you probably already employ a web developer. unless there’s a good reason, most people won’t learn an entirely new GUI toolchain.

Electron apps ship their own chromium-based renderer, but ‘webview’ means the OS gets to use its own renderer. It’s still a browser-like environment, but at least the OS can choose the most performant one.