How many of those errors vould result in a full system crash, though? And how many of them are just going to cause silent and mostly-harmless data corruption?

After all, was the error in the first line a typo on my side, or a single-bit upset?

A while ago some researchers registered off-by-one-bit domain name typos, which due to physical key positioning were unlikely to be the result of genuine mistyping. I can't find a reference right now, but I recall them getting quite a lot of queries!