this is a pretty straightforward one I believe. allowing users to add a bio/about me for themselves will let other users know about their hobbies, favorite Pokemon, tiers they play, or just normal irl information about them if they so choose. it can also help new users better identify staff from regular users if the staff members choose to add information about themselves as new users tend to confuse between the two which is quite understandable given how overwhelming PS! can be when you're on it for the first time. it can also help users find people with the same passions and likings as them which helps grow the community. not much else to say, have a nice day.