I’d suggest one issue around usability for disposable chopsticks. The way its cut- flat surface on all sides, and the material- coarse wood, makes them difficult to separate and move against each other, thus making them difficult to pick up food easily.
All non-disposable chopsticks are made with smooth surfaces and cross-sections with some contours- bamboo, melamine, metal. They all have its own pros and cons. But all are easier to ‘maneuver’.
