No reason at all. Think of dyslexic (and Aspergers) people as the next stage of evolution.
Certainly not something anyone "suffers" unless being used as an excuse. plenty of proof out there that dyslexic people have only ever been limited in what they can do by old fashioned, inflexible teachers and people who can't deal with people that are different to them so like to label them with a "disorder" that needs lots of expensive drugs to "cure" in order to try and force square pegs into society's round hole.
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