That means around 16 caches. 3200 manpower (equivalent to 12 squads or 800 manpower per player). Try that on a balanced game on early-mid and your team will have a disadvantage of 12 squads. I agree that caches can work on late game with no effect in your manpower but that's late game. The real problem is the lack of early-midgame on big maps. If you decide to spam caches in 4v4 the enemy will have a huge advantage and will cap more territory and probably will destroy some of your caches.
I'd be nice to test that.
No I'm talking about just 4. Each cache gives +3 to each player. With 4 caches that's +12fuel across the entire team. If they have 4 caches, which isn't uncommon in 4v4, that's +48 fuel added into the game every few seconds. Of course the mode is going is going to be a clusterfuck when entire teams are getting 12 more fuel then they would in an average 1v1.
It's crazy that you can boost the resource rate of your entire team for what's essentially the cost of an engineer of one player. Changing the default points won't have any effect while the crazy cache meta is still happening.
It's especially bad for OKW who isn't even supposed to be able to boost their economy in the first place. That weakness is completely erased in teamgames.