1) I can absorb the information content maybe 10x faster by reading instead of listening/watching.
2) Video's pretty much linear and fixed speed, while I can take text at my speed. If I don't understand a point, or want to refer to it later, I can do so very easily.
3) When reading, I don't have worry about accents making speech incomprehensible, even in English. In others... well, I can read several with fair comprehension, but can only understand very simple "la plume de ma tante" French.
4) And when writing, I can take my time, lay out my arguments logically, and not for instance be tempted to punch out the lights of people who won't let you get a word in edgewise.
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