Trade route management really needs 4 options:
1) automatically renew the selected trade route
2) automatically select the highest value internal trade route
3) automatically select the highest value foreign trade route
4) always ask me to pick a trade route
1-3 wouldn't bother you again unless you went in and manually canceled them.
It's a trivial task to manage trade routes early game (or on small maps) when you've only got a handful of cities, but once you're up to 10+ cities with 3 trade routes each and 3 clicks to select and confirm your choice of trade route whenever it expires, it gets tiresome.
It's not as though there's particularly interesting decisions to be made either - most of the time you're just deciding production/food vs money/research and then you choose the one with the biggest numbers - so it's largely just busy work you have to deal with before the things you actually want to focus on. I found it very frustrating fighting a fairly tense war in my last game where each turn I was eager to direct my units but it'd pull me away so I can tell it "really, just do what you did last time" on 2 or 3 expired trade routes.
I have a question. I'm trying to win the game but I can't figure it out. How do I go about building an Emancipation Gate? I have level 14 in Supremacy and I have hypercomputing researched. Are there any other pre-requisites?
I've not done the Emancipation victory, but if it's anything like Transcendence or Promised Land it'll be an option in the Wonders section of your cities' production list and it'll prompt you to place it on a map tile when you start building it. There may be other prerequisite actions required before you can get to build it though, as shown on the Victory screen (you may have already seen/done those - the first step is launching a Lasercom satellite).