Because someone has to keep the tradition of asking for them every month.
For a Scandinavian dev team the game has a surprising lack of ships and water-based activities. Or even oceans.
Suggestion: sailing ships or large sail boats as the water equivalent of the wagon, and restricted to deep water. Water PvE in the form of whales, sharks, as a type of mid-game hunting because land animals become too easy after a while; exclusive deep sea curios, and ship v. ship archery PvP. And larger water bodies, of course.