I explained my issue badly. Here's an example. I traded for Feudalism and acquired it from someone else. Since there's no tech brokering I can't trade Feudalism to anyone else. As such it doesn't show up as a tech they want. It just seems weird because they went through the trouble of showing us the techs they have, but can't give. Shouldn't we have something that can show what they want but can't give them. Thanks for the info on flanking.