More strict trade city rules

speaks for itself. In every player-built trade city I’ve a lack of docking ports, landing pads, buildings so high only small shuttles can dock, etc, etc.
I’m getting sick of having to return crates because the trade city wasn’t suitable for docking/landing my ship.

I agree. One major improvement I could see is a “trade centre” icon on the DynaMap to give a specific location to trade at. In some cities the trade centre is nearly impossible to find as it is so developed, or it’s just tucked away or looks like any other building in the city.