LXQT is a lightweight and modular desktop environment that is a port of LXDE written in qt.
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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 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.
Pro Beautiful GUI using KDE's Qt so it looks familiar
Pro Great for old and low-end devices
LXQt is unparalleled in its ability to run on the weakest of machines without a problem.
Pro Utilizes Qt
As the name suggests, LXQt takes advantage of the Qt ecosystem to provide a beautiful and performant user experience.
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 Not quite ready for open deployment.
In the current state, LXQT is a beta desktop that feels like a heavy alpha. A lot of the tools and underlying features are in a testing state, while the LXQT project itself has not had a gold (1.0.0) release as of yet.
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.
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.