Mech Infantry requiring Iron would be crippling, for u see, The side of pangea I'm on absolutely lacks the iron, they're all hidden in the far north or far east.
Only me on my side of the map actually have oil, 60 of them, and i only have 30 left over xD
That would mean the people with lack of iron and oil suffer and only can use Infantry.
There needs to be modern Infantry for such situations with slightly beefed up strength.
And Mortar / Modern Mortar yes please! I want them, I tend to have crossbowmens well into the age of tanks and plink them for 2 damage amusingly. Sometimes, they even finish off near death units xD with 2 hp and lower that is.
If I was to follow the mech infantry above, that would mean, I only have four Iron available to me. And that's after conquering the persian lands. I only can field four mech infantry and that's it, all the iron is in two other super powers, songhai and rome. And i'm battling both of them at same time.
Oh well i guess it won't matter too much cuz i been using a combination of panzer/modern armors and with occassional mech infantry. but still. I don't wanna be using WW2 Infantry in the age of mech infantry.