The only real advantage of simultaneous turns is that the time in between turns is almost nothing, which is nice. In the last beta, I had almost instant turn timers for the first 150 turns or so, but then some back-end processing started to increase the timer despite the simultaneous turns. But, for a single-player game, everything else about simultaneous turns is pretty much a negative compared to ordered turns. The movement is awkward and clunky, you have to click like a crazy person to move an army first when the turn rolls over, and you have to deal with too much stuff happening at the same time (trade routes breaking, attacks, people moving into your path) while also just trying to take your turn. It's just annoying, really. I got used to it with Endless Legend, but EL would have been better with ordered turns and Humankind would be, too. Unfortunately, that's not going to happen.
With regards to city visuals, I don't mind too much that the infrastructure doesn't appear as a concrete model somewhere in the city. But, overall, I find the city graphics to be lacking. They did a good job making different graphics for each culture. But, the non-emblematic quarters don't look distinct enough. And I'd like to see scattered lumberyards in the forests when I build the lumberyard infrastructure. Maybe some aqueducts here and there when I build that infrastructure. Stuff like that. Right now, cities look like a disjoint bunch of hexes that don't flow nicely together and don't "level up" in obvious ways. And they all basically look the same.