Feature request: Alliance does not mean open borders

[Kzer-Za]

Before creating

• This is NOT a gameplay feature from Civ VI, BNW, or outside - see Roadmap
• This is NOT a gameplay feature from Vanilla Civ V or from G&K - If so, it should be a comment in Missing features from Civ V - G&K #4697

Problem Description

Could we please have alliance and open borders as 2 different concepts? Meaning that an alliance would not automatically lead to having open borders with the ally; if you want to have open borders with them, make a separate open-borders pact.

Why:
First, it's not what you see in real world. Alliance does not mean that an ally can arbitrarily move any troops through your territory.
Second, it's bad from gameplay perspective because open borders is the most detestable feature of the game. I have not seen a single thread on the internet where one would say that he would want to have open borders with AI except for the purposes of a sudden attack, and this reason is void in Civ V (which is a good thing).

Related Issue Links

No response

Desired Solution

Decouple the concept of open borders from the concept of alliance, make it 2 separate agreements.

Alternative Approaches

Make it an option so that people who want alliance to automatically lead to open borders could also be satisfied.

Additional Context

No response

[yairm210]

Not sure what you mean here - what kind of alliance? Declaration of Friendship and Defensive Pact both do not include open borders. If you mean city-state alliances, city-states aren't players