4 points
I find it most inconvenient when “they” is used to refer to one person and a group in the same paragraph.
4 points
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Is that any different than when you have two people of the same gender and suddenly can’t use plain old gendered pronouns to unambiguously refer to the two people?
Eg, if Susan took Anna’s apple, it’d be confusing to say “she took her apple”.
3 points