At the moment I am completely baffled by the entire trade route interface. When you are selecting a trade route, every route can have a lot of different yields, but it seems like they are basically arranged in random order so it's impossible to compare them. So one route might show the yields as gold, prod, culture, faith, whereas another will show culture, faith, gold, prod, and so on. This makes it really hard to figure out which ones are the best, and while there is a filter option (so you can, for instance, only view routes that have gold) there doesn't appear to be any sorting mechanic.
I am equally confused by the "available trade routes" on the top right. It seems like this only appears if you have an actual trading unit selected in a city, and will only tell you the available trade routes from that city - at least on my screen, it doesn't tell you what trade routes would be available if you moved it somewhere else, which if I am correct, seems like a major oversight. Also, if part of the idea with trade routes is you set up trading posts in cities that allow your trade routes to extend farther, I would really like some interface options to allow me to plan this out. Like "I want to eventually get a trade route to Zanzibar on the other side of the map, where do I need to establish a trading post first to make that happen" and sort of plot out how you are chaining them together. At the moment I am basically just choosing randomly based on yields and I feel like I am missing a fairly large part of the experience.