:) I'm usually on a reptile forum which has sections within sections within sections!! (for instance.....Snakes is a section, when you click on it it separates to boas, pythons, venomous, colubrids, and general.... But then if you click pythons it separates to 8 different snake species... yadda yadda!)
It's for ease of use.. If someone joined to learn about breeding, it helps to have breeding in it's own section, instead of having to surf through people posting about deaths, sick bettas, random questions, and photos.. Just a section about breeding! Plus, like mentioned earlier, people who have knowledge of healing sick bettas would gravitate towards the emergency threads, and those emergency threads can get answered faster because they won't get lost among the many posts!!