They do, they're synched with barbarians who receive techs depending on the general development of the world. But maybe I should revisit this because it seems the effect is deliberately weak to keep barbarians behind in tech, which isn't really desired for independents.Can independents have the Japanese UP or something similiar to make them on pair with other civs tech level?
Still, it's kind of hard to balance because independents exist all around the world, so having them on par with the tech leader might hurt other civs.
I don't understand your reasoning here. How does it give other civs a boost?Should AI treat all wonder values as zero that they cant build? Is it possible to just lower the value it attaches to it? Like only 25% of earlier? It will give other civs a boost when they get the wonder and the Ai original owner might be able to build it later.
When deciding what to research next, the AI is mostly making a short term decision (the AI can plan a couple of techs in advance, but still recalculates often enough to take changes in state religion or civics into account). In this context a wonder that is impossible to build is literally worthless.