Graphics tablet cursor smoothing cannot be disabled
A configuration option to disable graphics tablet smoothing in libinput.
The option would decrease latency from movement on the tablet to movement of the cursor at the expense of less stable cursor movement.
Implementation in Other Systems
On Xorg/xf86-input-wacom I can achieve this with:
xinput set-prop "Wacom Intuos PT S Pen stylus" "Wacom Sample and Suppress" 0 1