* Texture: The byssal threads are tough, fibrous, and unpleasant to eat. They have a sort of plastic-like or bristly texture.
* Grit and Debris: The threads often trap sand, grit, and other debris, which would make the mussels gritty and less enjoyable to eat.
* Safety: Sometimes there could be small shells and potentially sharp bits embedded in the byssal threads.
Removing them ensures a cleaner and more pleasant eating experience.