User has various problems with crashing under X11.
Link: Plasma is completely crashing when i open or close pycharm, run xrandr or even inxi
Same, it works fine.
They mean inertial scrolling.
Like you two finger swipe up quickly, release, and it keeps scrolling.
It simply does not work everywhere with libinput as the API is such a way that the application(s) themselves must implement it. As opposed to the hacky old way where it was basically some math of events being duplicated.
As such it exists in some applications, like firefox, but not all.
https://wiki.archlinux.org/title/Libinput#Inertial_scrolling_does_not_work_in_KDE