Well, I certainly agree leaf techs should be worth the effort. I don’t mind the idea of leaf techs. But I think the implementation is a bit patchy. Irrigation is a good one. Military Tactics is a bad one. Not sure about the Merchant Republic one. I’ve been wondering for ages how Military Tactics could be made a better leaf tech. My current thoughts are that the tech could give you: +1 promotion for all land and sea melee (that would have a bad synergy for medieval UUs though), one off bonus for GGs and GAs; reduced unit maintenance (and so maybe get rid of the conscription card); or unlock ranged attacks for walled cities (rather than just getting a ranged Attack for having walls). Another option would be to just make it a civic, so you’d then get Pikes in the Civics tree.