> stuff like Electron.", so I guess you still might need to use those

Yeah, stuff like Slack for work. But there it's a bit different: they chose Electron because it makes them more productive even though it ends up in a worse product. It's sad, but it is rational to produce crap that makes more money.

That would be a reason to use React for a mobile app, maybe. But writing a mobile app in Qt is not more productive :-). I am very convinced it costs more money and results in a worse product.