Xfce works very much like the classic Gnome & Windows desktops, taskbars (panels) and desktop icons, letting you get your work done without being frustrated. Xfce embodies the traditional UNIX philosophy of modularity and re-usability. It consists of a number of components that provide the fu...
In order to keep the system light weight and CPU/GPU non intensive LXDE forgoes a compositing program, because of this there will be screen tearing. Though a compositor like Compton can be added for those that want it.
Since it's basically a fork of Gnome 2, and it's created to satisfy Gnome 'purists' it's very unlikely for it to add new features more in line with modern DEs. But It doesn't mean that it doesn't/won't support modern apps.
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.
It runs for weeks on end without noticeably increasing its memory footprint. It continues running smoothly over extended periods of time. Applications that used to crash in gnome-shell (skype-for-linux, wire, firefox) give me absolutely no problems here.