As you say, I think you’re right for many classes. But in other classes, apps are entirely widgets. I’m looking at the first Electron app in my quick bar: Spoti

As you say, I think you’re right for many classes. But in other classes, apps are entirely widgets. I’m looking at the first Electron app in my quick bar: Spotify, and thinking about how to make it portable without being Web. It’s all widgets, no canvas. If you made it in any of the above it won’t feel Spotify it’ll feel Qt or whatnot. For Linux and FOSS types this is usually fine. It’s sure fine for me. But for the vast majority of users it isn’t. And I don’t think anyone wants to write the application natively thrice. When it comes to “mostly canvas” applications I find myself thinking about using game engines. They’re portable and basically that: a canvas with some basic UI support.