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I am now happy using Qt-only lightweight apps like QTerminal (graphical term), Marble (K-OSM, Qt-only port), QupZilla (WebKit web browser), Trojita (WebKit mail), LXQt (lightweight X.org desktop everywhere), Liri (lightweight Wayland desktop in Parabola), Lumina (lightweight X.org desktop in FreeBSD).
Marble is a good example which KDE splits apps to Qt-only thin clients and KDE deps. There are some apps enough lightweight and not needed to be split to Qt-only and KDE deps like SDDM, the Simple Desktop display manager that is flexible between Qt-only and KDE-integrated.

I wonder how much of a difference it makes with the KDE frameworks 5 refactor, since KDE apps now only depend on those parts they actually use. Is there really that much bloat in the framework libraries that it makes a significant difference? (esp. considering that by not using the framework library the app usually has to reimplement that functionality itself)