Cinis should always have Gold Fertility
(Not so) hot take: but Cinis is always going to be your largest island, probably the capital of your empire so it will have the largest number of Patricians. So it only makes sense to make gold a ‘default fertility for it’
Having seeds where Cinis doesn’t have Gold fertility makes it very hard import ALL the gold you need - especially as it’s the island where it makes most sense to have Vulcan as a deity (and the highest increase in productivity)
I’m currently 100h+ into my current save and it feels like a gold rush to keep the capital constantly supplied with gold.