More choice for the players = more power for the players. People can't see the usefulness of expeditions because of their style of play. What if you have a busy week or more incoming, and can't raid for resources to put your workers to do something? Send them on an expedition and you get some nice goodies when you get back into the game. Or you need to collect oil for your big airstrip upgrade, but can't chain 3-4 hours of oil raiding and be online so your oil doesn't get stolen. Well, get the peace treaty expedition done, activate it and continue raiding sometime later with no fear of being raided yourself in the meantime.
Marco Polo, also more choice, you can turn on tryhard raiding boots and attack a lot of Koreans, and get 5 troop card armies, or get a backup resource of your choice in inventory ready to be claimed at your leisure. Could be better, but the offers are getting better and better already, to be fair.