LXQT is a lightweight and modular desktop environment that is a port of LXDE written in qt.
Ranked in these QuestionsQuestion Ranking
Pro Lightweight emphasis
With a focus on being "light-weight", it is to KDE Plasma what XFCE is to GNOME: a familiar enough looking lighter alternative to the more fully featured environment that may work better on lower-end devices and for people who want as lean a system as possible.
By taking advantage of the modular KDE Frameworks, LXQT is able to offer a modular architecture that allows the user to easily swap components.
Pro Beautiful GUI using KDE's Qt so it looks familiar
Con Unthemeable for usual users
As all Qt desktop environments themeing is hard since you need to know C++ , there is a sideway using qss however its not as powerful as GTK, Enlightenment or Windows theming.
Con A lot of bugs
This is a very disappointing desktop environment, it's very buggy. Although there still is hope that these issues will be resolved.
Con Missing Features = Lightweight
For the LXQT developers, lightweight is a synonym for missing features.
Con UHD screens hardly supported
DPI settings are not adopted. The readability, usability of this DE on UHD screens is not advisable. Fonts are not scaled at all.