I'm not sure why you guys think this is such a problem. Although borders can expand past the 3-tile limit in Civ6, you can't manually buy tiles past this limit and so this is not a valid way to secure an important resource. Civ7 will have Towns which you can specialize, which seem ideally suited to securing a resource.
The devs have said that the goal of Civ7 is not to cover every tile on the map with your cities, so there might be unclaimed tiles in between your cities, and this shouldn't be a problem.
The devs have said that the goal of Civ7 is not to cover every tile on the map with your cities, so there might be unclaimed tiles in between your cities, and this shouldn't be a problem.
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