Sooo, i didn't knew how much having a troll taking residence in your cave sucked until i got one myself.
The fact that they don't despawn at some point baffled me, though. And that's the main subject of this thread. I do not mind at all their great power which cause fear to even a seasoned hunter... But why oh why don't they despawn after a while?
I'd even be fine with trolls despawning after a couple weeks / a month or so, if it means that eventually, you don't have to say goodbye to your current mining area.