One major issue with native civs that makes playing them in the late game undesirable is the need to maintain both a full 100 vill economy and also manage the community plaza. It can be done by moving 20-25 vills from nearby estates every time one needs the war ceremony and then moving them back once it’s no longer needed. With the natives’ inferior economies, this is an absolutely necessary exercise. However, this is a strenuous macro effort, and it’s burden of which european and asian civs have no equivalent.
The solution is really simple. Give native civs (probably only to lakota and haudenosaunee who don’t get non-villager plaza participants) a Labor Ceremony that increases work rate of all villagers by 1.4% per participant. That’s a 35% work rate increase at 25 participants. 74 * 1.35 = 99.9. Using this number, this ceremony will only be efficient with a full 99 villager economy, so it’ll only be a late-game buff. This would drastically reduce the macro burden placed on native civs, and they’d be more enjoyable for everyone.