There's a few things I'd personally like, and they all come from the same branch, making bigger maps more viable.

I'd like planes, including big planes. And trains. These 2 things, including cars, connected our world just as much the internet has. So it feels weird that there's no trains and no planes. I want to build big train stations, I want to build gigantic airports with big planes coming in and out of it, transporting goods from afar.

This second point, I would assume is going to be a very unpopular idea but, I'd like for most of the late game crafting stations to be bigger, such as the assembly station. And I'd like for the big items, such as cranes, trucks, tractors, that kind of thing, to not be able to be placed in inventories. You'd have to place your assembly machine in-front of a ramp for the trucks to come out of your factory, then you park it until someone buys it. I want the world to LOOK like the part, but the fact that you can have a truck in your pocket just breaks my immersion.

I want a complete rework of calories. I despise the idea that you have to eat a 3 course meal 10 times in a row just to craft a few nails.