George VI had other problems. Along with his shyness. He was left handed and was made to use his right hand. That is a very debilitating thing to do to anyone.
It exacerbated his other emotional problems and caused him to stutter. He did, though, practice public speaking and with the help of his wife Queen Elizabeth (before she was the Queen Mum), he overcame a lot of his problems.
His wife, Queen Elizabeth, always blamed his young death on his brother Edward VIII. She felt his selfishness in abdicating to be with Wallis Simpson was one of the things that put extra pressure on George VI and caused his early death.
George VI did, though, do what Alexandra did not. He rose to the occasion like the true great grandson of Queen Victoria that he was. If only Alexandra could have been like so many of her ancestors, cousins and their descendants, she would have stood up and did her job.
Posters make all kinds of excuses for her, and while I know that some of what she suffered would be too much for even the long suffering Job (as Nicholas always compared himself to) to comprehend and deal with, we don't make as many excuses for others who were in equally tough situations.