EF maps have almost nothing. Even capping on maps like Sevastpol, Kursk, or Stalingrad doesn't do much.
By increasing the ammo and/or fuel though, you run the risk of Soviet blobs overrunning your DFPs early on and going for upgraded blobs and tanks. And if you were to stack one side with all the resources, you'd be at the mercy of random start location.
It's a trade-off, but we'll see more maps (like Stalingrad) having more resources added.