I can imagine taking over the throne from the longest reigning and highly beloved monarch would be stressful. I can imagine having the eyes of a nation upon you after the passing of your mother would be stressful. And, I imagine that using faulty fountain pens in front of many people and many cameras would be very stressful.
Now, fans are calling for King Charles III to switch to using ballpoint pens and saving us all the trouble of watching him have another outburst.