I know this has been brought up a bazillion times, but I miss the old LP system. It actively rewarded you for anything you did, how diverse it may be (hunting (dont forget killing in general, nothing wrong with some fair old PvP), farming, mining, etc. I felt by doing something, I became better equipped to do it, and enjoyed playing.
If I felt something became a grind, I'd switch to another activity.
Curios, to my knowledge, earn way less LP in general than the old system made you do, so character developement is slower, which it makes it a pretty long wait before you are any useful at all. Which brings me to the next point, waiting. I can literally log on 5 minutes a day, invest my newly gained (bit of) LP into something, check if I need to do something (crops maybe, not food as you dont get hungry while offline-studying), put some curios in my study and do whatever I want again. Ofcourse the social aspect and initial need for advancement in game still makes you play longer than that, but its not like playing actually helps your character -that- much anymore.
I do fully well know this will not happen, but I would like the old system to be returned.