Pressure sensitivity was only working on the caligraphy tool, not on the pencil! This is an huge improvement - The rendering of the pencil tool is way faster for me and i suppose pencil lines are plain paths with an strokeWith, so the resulting svg would have way less complextion on the path data, i guess. Not checked yet. :- )
I assume this was only missing in the MacOS version, because I used a wacom tablet with inkscape already 10 years ago.