In a bio you might be asked to list the pronouns you'd like to be addressed with. For example:
they/them/theirs
or
she/her/hers
But why does this list has three entries? Wouldn't it be enough to indicate "she" only, and the "her" and the "hers" follows grammatically from it? And wouldn't apply the same logic to "he" (with "him" and "his") and "they" (with "them" and "theirs")?
Or asked the other way around: Are combinations like "he/her/theirs" in a modern gender-diverse grammar possible?