I was under the impression that Yongles ability activated once he was over the 10 threshold. So 15 pop would yield 5 science culture etc etc.
10 population = 10 science, culture and 20 gold just seems so absurd to me. It seems to be it’s supposed to be encouraging tall play, but without any limitation - it’s just going to be optimal to continue to play wide and prioritise infrastructure.
Consider the 10% yield Civs Maya and Kongo, they would need to have 100 science, culture and 200 gold coming out of a city to see those numbers and that comes with a malus!? I know that also extends to production, food and faith etc but even those considered they are never getting close to those numbers, and Yongle can plop those cities wherever he wants. Even Menelik would need 70 faith per city to be hitting those numbers, I can’t conceive of something even *more* potent than the NFP Civs haha.
This ability really feels like it could have used a drawback. Especially when Tokugawa has 6 tile limit for a much less potent ability.