I have a question about the pronouns in profiles. I hope it won't be perceived as transphobic, that's not my intention. I'm not a native English speaker, so perhaps that's where my misunderstanding (and possibly awkward turn of phrases) comes from.

Why specify the object pronoun when the subject pronoun is given?

For example, why display [she/her], and not just [she]?

Shouldn't the slash be reserved for people who recognize themselves in more than one gender, like [she/they]?