CuteFishOS’s stated goal is to “make a better experience desktop OS”. To do that they’re building a new desktop environment (‘CuteFishDE’) using KDE Frameworks, Qt, and KDE Plasma 5. This desktop will sit at the heart of a new Linux distro called CuteFishOS.
The desktop experience caters to “beginners”, rather than power users. As such, the devs have no (current) plans to add complex, edge-case, or convoluted settings and features. Like Ubuntu, the aim is to provide a basic set of sane defaults that “just work” for most users.
There’s room for a polished, stripped-down Qt alternative to KDE, but I’m not sure if this one is going to be it.