Making units obsolete/worthless is what I was getting at in my post. I don’t think that’s exactly the case, but it can sort of make it a speciality item, and I’m not sure if the incomes are high enough for that. Not sure if I’m wording this write either.
Reading what you wrote about the late war carriers, maybe you could make the rules time related. Meaning they are like automatic technologies that appear after a certain round and just replace the older ones. All infantry gets those bonuses with movement and everything, and still costs 3 IPC, after the 5th round maybe. Fourth, even.
I don’t know. I like the idea (especially the mech inf), but it’s hard to implment.