It really feels like the devs forgot to add this basic +1 food to every water tile after harbour is created.
Hopefully this isnt too abusive. I'll test it right now! From the desc it feels fine. But I want to see how a city will grow having so much free tiles to get food from.
The fact that we don't get the farm bonuses for adjacency might make up for all the water tiles we wont be able to use for districts and heighbourhoods plotting.
Maybe a coastal city will never be as competitive as a landlocked city with those 11~9 food per tile. Maybe a food bonus from the seaport might prove ncessarly. Let's see! I'm yet to test it! But thanks for the awesome mod!