Early paper making was still far inferior to parchment. Without metal rollers that can put multiple tons of force on the pulp to press it together, then multiple other rollers to polish the surface, paper is pretty crappy in comparison. Papyrus was so good because like parchment used nature to make the surface that was written on. The fact that he could make a paper that would be written on with a quill is impressive, but more then likely the point was pulling up the fibre of the paper and making the characters messy looking.