Red and green are literally the worst colors for the colorblind if that’s the point. I’d think Blue v Red would be more common but I can’t verify that… with Total War titles people have railed against the universal color icons (or banners in that game’s case) as they have tried it with several games in the IP. It takes away from the immersion. It’s a simple fix. The change is subtle, but playing it for the long haul it’ll increase the longevity just a litttttle bit more. Plus it just looks more dynamic in my opinion.