It uses JS like the early web did: for little pieces of logic here and there. It isn't based or structured around, and certainly not made of, JS. It's fine. I don't like JS neither, but I do like QML.

Also, feel free to use QtWidgets for desktop apps, it's IMO the better technology for that unless your data is simple and you want it to look like a typical touch UI for some reason.

Fortunately you can still just use QtWidgets. You just don't get fancy animations.