Other than that, using a big vocabulary can be a double edged sword: it can improve communication by improving the precision, accuracy and concision, but it can also be used to limit it, either by turning a text into a sterile show of learning or by actively discriminating those who had no chance to learn that vocabulary, expecially if they are not native speakers¹.
I don't think that limiting oneself to 1000 words is the right solution, and I agree that explaining words that — in the context of that specific communication — are not common is a better option, but I do think that the concerns raised by those who propose such things are valid.
¹ unless they are native speakers of a romance language, who end up having to duckduckgo up "erudition" because they don't remember the word "learning", but that's not really the point :)
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