The research for ink and ink stone was carried out smoothly, but paper making technology wasn't.
Wor accidentally made papers that couldn't go well with a feather brush. If there was a type of paper that could only be used with a writing brush, and that required many other combinations and writing speeds, and was comparably slower, one shouldn't hope that it would be popular and common. Because writing was a tool, not an art.
Thus, efficiency was more important, as compared to mere appearance. But, to invent a paper that a feather brush could write smoothly on, and ink would smudge on, well, that's easier said than done!
