Every example you provided was extremely unambiguous and without anything that might require distinction between singular and plural. Often language isn’t that simple. For example, “Fion had finally joined the party and they were happy about it.” Who does “they” refer to in that context? Yes, you can write/speak your way around it, but that adds extra difficulty that isn’t suited for casual speaking/writing. That is why people (who aren’t transphobes) don’t like it as a pronoun and would rather have a new word.
In your sentence they unambiguously refers to fion. It’s really not that hard for a fluent speaker. I’m not a native and this shit is simple, it’s unwritten but innately known like the order of adjectives when multiple are present.
Every example you provided was extremely unambiguous and without anything that might require distinction between singular and plural. Often language isn’t that simple. For example, “Fion had finally joined the party and they were happy about it.” Who does “they” refer to in that context? Yes, you can write/speak your way around it, but that adds extra difficulty that isn’t suited for casual speaking/writing. That is why people (who aren’t transphobes) don’t like it as a pronoun and would rather have a new word.
In your sentence they unambiguously refers to fion. It’s really not that hard for a fluent speaker. I’m not a native and this shit is simple, it’s unwritten but innately known like the order of adjectives when multiple are present.