Simply because not to be retrieved too easily. I also avoid identifying gender as much as possible -Except for weblog related with music. For example, I express cities and countries with geological formation, azimuth direction and position. I use name of occupations and positions instead of people's names. excuse me for roundabout expressions
. -Although sometimes there are exceptions. However, recently, I read that some English-language media started using "they" as the gender-neutral third person singular.
So I'm going to follow -but on the second thought, I cannot figure out how to use yet.