I have listened to and read in the lightweight Qt apps and they are quite practical, like Qterminal and Qupzilla, and the KF apps (KDE) are quite needy of hardware system resources, and I need to experiment if the lightweight Qt apps are wrought well with KDE, getting this MAJOR con against KDE improved out-of-the-box. Have you guys also experimented of lightweight Qt apps (AND INSTEAD OF KF) with KDE and are they recommended to us?
Honestly, I am an LXQt keen user for Qt and Cinnamon keen user for any non-Qt platforms, finally MATE keen users for Arch distributions.

If the Qt libraries are installed they should work.

Yes lightweight Qt apps should be just wrought alongside KDE under Qt as the common language, however the some KF apps have been integrated with the GTK+ apps, by replacing lightweight Qt apps over KF we should lose these integrations with GTK+ apps, making lightweight Qt apps being wrought best but non-Qt apps being wrought worse than expected.
Of course I am ok to mostly Qt apps but this needs to be an issue to an Unix novice being newcome with KDE to be his desktop shell, an assumption is which he dsnt know well which Qt is the software platform serving KDE, even replacing my lightweight Qt apps instead of the some KF apps loses his GTK+ frameworks, finally he complains to me and just hates KDE.