Your comment is just darling. "Given that perhaps 90% of Excel spreadsheets have errors ..." -- a completely made up statistic leads to -- "I fail to see that Excel is a good or useful tool." -- a conclusion that doesn't even follow from your made up evidence, even if it were true.
Nicholas Taleb would be rolling over in his grave, if he was dead.
"My refutation of the VAR does not mean that I am against quantitative risk management - having spent all of my adult life as a quantitative trader, I learned the hard way the fails of such methods. I am simply against the application of unseasonned quantitative methods."
Use of a paradigm that has such a high error rate is, at the very least, an "unseasoned quantitative method".
Nicholas Taleb would be rolling over in his grave, if he was dead.