Remarkable

This question comes up often enough that I wrote a web page which has my usual response, with a detailed explanation.

TLDR: if the nib is harder than the screen, then over time the nib will slowly damage the screen, particularly the textured coating on top of the screen, so I choose not to take any chances. Plus I physically have over ten years' worth of replacement nibs on hand, I doubt the tablets themselves are going to last that long.