So i did go back to playing progress as Babylon (the best civ to play progress IMO) on Epic Emperor Pangea plus standard size 16 CS 8 civs no ruins or tech trading (bribed wars on) and i managed to get a comparatively late Science victory on 1943 to what i can do with Authority. I modified the tech costs to be roughly 15% more expensive after the medieval era. I did play as any progress civ would do -but to be fair i had a very slow production-starved start- settled a couple of cities (capital + 7) and worked on getting vassals (had two vassals after capturing their capitals by the Renaissance era) and just turtling till the mid game constructing as many academies as possible but i just found as was lagging behind my usual "schedule" despite trying to min max and micromanage my cities. I could definitely feel what progress is better at than authority; overall better control over happiness, much more gold from instant yields but culture and science generation is noticeably less in the early game. Progress just lacks a strong culture generating policy like Authority's opener or tribute, the culture on building construction is just really slow to take off and even when prioritized it's inferior to Authority scaler when it comes to raw production speed. I'm going to try again on a better start other than Jungles with no hills or pastures to see if it's just a slow match due to the terrain or not.