The buff of inca suddenly makes inca really really good. They seems a bit like Byzantine now but actually they are better than byzantines.
Byz doesn’t have any eco bonus until clicking imp. Inca actually has something, llama, fewer houses, allowing 1 or 2 fewer vills on wood early. Like Byzantines, they have cheaper pike and skirms, to defend against archer/cav, but byz halbs are missing attack, inca one is fully upgraded. In late game inca vills are very hard to raid, which is really nice for survival, because a few light cav raiding and you don’t see it, you can potentially lose 20 or 30 vills and it is dead.
Cheaper militia line is essentially free supplies, which is very nice. Significantly cheaper kamayuk, synergies very well with the cheaper castle, which make it very easy to spam, and it happens kamayuk is a unit works well in large groups only, so being able to mass them really make a big difference.
Cheaper and potentially stronger slinger is a huge thing. They are unaffected by the crossbow/arb nerf, as they don’t need upgrade, just straight away usable in castle age, doesn’t need to switch eco balance if you make infantry, as they cost food/gold. They also are unaffected by the gambeson buff to swordman, crossbow will do quite a bit less dmg to swordman, but not the slingers with huge bonus dmg. Late game, slinger used to max out at 8 attack, which is terrible, arbs are always preferred. Now slinger max out at 9 attack, which is decent against even light cav, there is almost no reason to do arbalester upgrade, it had upgrade cost increased recently, but inca has slinger now it is unaffected by arbs nerf.
Then eagle nerf, also does not impact inca, inca has the same cost as before, even cheaper in imp. Not only inca is buffed, it synergies so well that a lot of previous nerf to units doesn’t affact inca. Nerf to crossbow/arb, inca uses slingers. Nerf to knight and buff pikes, great, inca doesn’t have knight. Nerf eagles, but not inca eagles. Then buffed kamayuk, pike, skirms too (especially kamayuk). And the slinger unit does so well against all the recently buffed units, militia line, unique infantry, pikes, they don’t do well vs recently nerfed units, like knight/crossbow. This makes inca comparatively much stronger.
Btw i am not complaining though inca is one of my favourite civ very happy to see it jump to top tier