React got popular not because of its amazing time-tested ideas (everyone knows they re-engineer everything once every couple years!), but, strictly speaking, because at the time it was released there wasn't any kind of serious SPA or partially-SPA framework for the web and also because JavaScript sucked a lot more at the time (no classes!). Qite is perfectly suitable for complex UIs thanks to its state functionality, you can build pretty complex functionality and UI and not sacrifice user's CPU in the process.