Callins costing no fuel basically meant that you were not using your fuel,
and starving for manpower, which meant that relying on callins only was less effective. in coh2 on the other hand spamming kv1s, shermans, etc was a huge problemgood points, added
i`m pretty sure it had a system for that
From what I've heard, the manpower-only costs in coh were considered balanced only because controlling territory added to your popcap, and without any territory, your popcap was too small to get much. In coh2, if you're on the back foot fuel and territory wise, you can use callins to get tanks anyway. In coh, if you were on the back foot fuel and territory wise, you couldnt use callins to get tanks anyway because you wouldnt have the pop cap to get them.