One crafty little thing that I noticed in the Victor Open Dev that will come as something of a shock to Civ players, is that Resources are also required to build some of the mid-late-game Infrastructure, not just Units.
There are several Production-boosting structures even in the Medieval Age (High Furnace, for instance) that require Iron or copper resources, Grain Silos for a Food boost in the Early Modern Age require as many horse resources as Knights, and a Military School to boost the production of military Units requires more different Strategic Resources than any single unit. People who search through the Tech Tree to find unit they can build without scarce Resources may discover that they needed them as much for the structures and boosts from them as they did for Units.
And I think that's a good thing, especially if strategic resources will generally be as scarce as in the Victor map. I certainly like it better than the approach in EL or ES2 where one needed to stockpile resources over time before constructing some units or later game buildings. Maybe not as nuanced but less headache and gets the point across as well that you need to secure those resource nodes, either through expansion or diplomacy.