Rationale: a single unit of Bandeirantes can result in thousands of science, culture and gold in the mid-game, far exceeding the yields obtained from any city state alliance. The problem is that it's a unique unit which you don't need more than one or two of, so you're basically getting the entire benefit from Brazil's UU. There's a similar problem with Comanche Riders generating science. The situation is much less problematic for Comanche Riders, because you need to be at war and in theory it might even die (although it's a very safe unit), but it still has the potential to generate thousands of science from a single CS unit gift so I think it's cleaner to remove that as well.
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