I am roughly halfway through my first playthrough as Sejong on the default difficulty. There was definitely a learning curve throughout the first act and it took some time to get familiar with the UI and menus. By the end of the first act, I was on the top of the standings after defending myself from an expansion war from Jeanne d'Arc. Despite losing a city in the war (partially because I was not paying attention to my outlying cities), I won nearly all the skirmishes against her, which boosted my prestige/standing. I also constructed a triumph that had an extra prestige boost from an event (I forget how Ara labels those).
As the second act started chugging along, I got into the flow of things: I started checking my production level for resources, supplying/upgrading my resource and crafting buildings, and it clicked how regional resource production could be better optimized in future runs. I love city-building games and resource management, so managing my nation was very satisfying. I do wish buildings had the option to be sorted by type or could be searched for by their products rather than solely the building name. It is indeed micro-manage-y but I have been enjoying the gameplay so far. However, this second act has been relatively peaceful, so I have had the attention span to just focus on my production lines and my cities. If things were really hectic, I do think it'd be hard to keep up with the resource management element of the game.
I have around five or so paragons in buildings to create masterpieces, and I am producing a lot of masterpieces. It has gotten to the point where I sometimes skip unveiling the masterpiece so I can get to other things. I am still on top of the standings with ~1,000 point lead. My capital isn't super optimized, it is vaguely research focused, but not as focused as it could be, as I had to ramp up paper-related and raw building resources for those buildings and I'm only now in an okay place.
I do think I have a pretty smooth (maybe easy) path to the end of the game, especially since my neighbor Jeanne d'Arc, who has disliked me since we first met, is probably on the way out upon the conclusion of the second act. I'm already looking forward to a new game with a higher difficulty and different leader, perhaps to try a more military focused game rather Sejong's masterpiece/research focused gameplan.