The group I play with has restarted a couple times, when we feel like playing again. Despite that we've sunk plenty of building effort into seeds we probably won't come back to. Each restart is an opportunity to learn something and build memories we can take to the next world. I was really proud of the farm I set up in the plains in the last world we had, more proud than the plains farm I set up in the previous one. I look forward to the next restart so that I may build one that is even better, perhaps in the mistlands this time. (Although if you can't grow flax and barley, maybe I should try to find an area where mistlands meets plains and put it between the two.)