Even if the mechanics are changed I don’t see the problem. The more unique and realistic a civilization is, the better. “Lakota mining” is one of those crazy mechanics that I hope will change in the future. This is my proposal about it: Possible New plot solution on obtaining Lakota and Haudenosaunee coins
And this is a card that helps in the late game or treaty economy of the Lakota. If they improve the economy of the Lakota, it will not be necessary for their cavalry to be OP:
A Possible New Letter to the Lakota: 'The White Buffalo’
You will receive a white buffalo that will give you 2000 experience and he will be able to work in the square with the rhythm of 5 workers and will count as 5 workers. In case it dies you can create it in the square. (Age IV) (Does not occupy population)
Another change I hope they make in the future is to remove the Mayan ally card for the Incas, which I’m sure doesn’t make sense. Unless I’m the one ignoring something.