The trend is to post less and less info about users.. unfortunately. I would have gone the other way, asking for MORE personality details. Actually the one word personality descriptions aren't that useful, and my God, it seemed like 80% of the people were describing themselves as 'introverted.'
If you're going to ask personality information, really there should be several questions, not just a two word phrase, it WAS a little silly to ask people to describe themselves in two words.
I've not noticed until you wrote this question. If you hover over someone's name though, it still shows their personality trait but they'll probably remove that soon. They may be changing it up, adding more options or have removed it forever, for some reason. You'd have to ask an admin. I liked the personality traits though.