1) Idiomatic speech is difficult to deviate from. So to be careful, you have to be constantly on guard for how you might be perceived. ("He" as the generic pronoun is also in this category.)
2) HN has a wide audience, including people from the US, UK, and many countries that don't speak English primarily. So understanding how others might perceive you is more important here than among a group of close friends.
1) Idiomatic speech is difficult to deviate from. So to be careful, you have to be constantly on guard for how you might be perceived. ("He" as the generic pronoun is also in this category.)
2) HN has a wide audience, including people from the US, UK, and many countries that don't speak English primarily. So understanding how others might perceive you is more important here than among a group of close friends.