By the time I finished Vikings I was to the point where I necer wanted to see a Settlement again.
Because of the changes and the opportunity to learn new techniques and because it's not a white background (heh!) I'm having a lot of fun so far with Japan.
Maybe that will change in a few iterations, we'll see.
Wish you could fight In the merchant hut instead of negotiating it would just be called the hut and it would be kinda a spoils of war thing where they give you the goods for winning
While being able to use your city's troops and attack boosts would be kinda silly and horribly repetitious, we already got plenty now, there's a whole lot of design space for some kind of combat in Japan or with Vikings. The flavor aspect (Ninjas and Samurai, Vikings plundering towns) can't miss.
Way too much for INNO to tackle and could easily overcomplicate Settlements, but it does make for some interesting daydreams..