King Flevance
Deity
I agree, it is frustrating to not able to swap ownership of a tile between my cities. I now play a game where I avoid claiming a resource because I plan to place a city that needs to use the 2-3 tiles next to the resource, but if I claim it, those 3 tiles are permanently assign to the first city.I wish you could buy tiles and swap them. There's so many individual little conveniences missing from Civ 7, but this is one of my biggest icks so far. I'm not too critical of city distance, but Independent Powers can be super annoying to deal with. There are a lot of times where I wanted to settled a port city in the New World, only to have to clear out the natives next to me when I wouldn't have otherwise.
As for the main topic, the pockets in my empire are a concern mostly because the AI doesn't mind placing a city in a horrible cramped location for 1 crap resource. If you attack and burn it down, another AI settler will eventually show up as though it is juicy real estate. It would be nice if colonies from civ 3 came back so that merchants or some other unit could create a "trade outpost" to claim nearby tiles and expand your trade range as though it were a city.
I personally would have it claim the tile it is built on and you could spend gold to claim nearby tiles to your empire (up to 2 tiles away) at about 500 gold per tile. Additionally, you could spend gold or influence to upgrade it to a town.