I finally put my finger on a desired feature I have for the Civilization series of games. I think military unit construction and buildings/wonders/districts/settlers (everything else) should be two separate build queues. Cities should build military units simultaneously with buildings. So you wouldn't be choosing between constructing buildings vs military units at all. Constructed military buildings like barracks would still affect quality of military units, and civics and technologies would still affect types of military units available to build. Often in games I feel like I never have enough military units to wage fun strategic wars. And ALWAYS technology advances so fast (even on slower game speeds) that by the time I get to building military units, they're outdated, this is especially true in the earlier eras.