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Why is it necessary to need 50 rep to comment wouldn't 20 be fine, I have seen people post comments in answers because they were unable to comment. requiring 20 rep would make more sense. should this be changed?
Comments give you the power to bother any answerer on the site. This site is meant to be for experts, experts we want to retain; the best way to lose our experts is to drown them in notifications.
This is why the bar to comment is "so" high.