RMS could have taken a photo of his screen, or done something cheeky like dump his screen to a padded ASCII text file and submitted that. Stick in the mud.
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Linus Torvalds often says that he does not know how to do X (like install a Linux distribution, or other simple stuff). I wager that it's a status thing.
Why am I am not good at excel, it is because I am the person who tends to fetch the data from the different systems and consolidates it for the analysts to analyse and some do use Excel to analyse the data.