This seems like a pretty big oversight by the BNW team. They made the very smart decision to not only split GWAM counters from the other three, but also to make each of Musician, Artist and Writer have their own counter as well.
This is a much better system - if I want a Great Artist I've fill Artist slots, and I don't need to worry about a Great Musician being born somehow delaying the Great Artist.
But for some reason Engineer, Scientist and Merchant are still shackled to each other, which basically means that unless you're Venice you never ever want a Great Merchants. Very unfun system.
This is a much better system - if I want a Great Artist I've fill Artist slots, and I don't need to worry about a Great Musician being born somehow delaying the Great Artist.

But for some reason Engineer, Scientist and Merchant are still shackled to each other, which basically means that unless you're Venice you never ever want a Great Merchants. Very unfun system.