mechs are vital, If I am doing a barbarossa, then germany buys 17-20 mechs on G2 and 10 on G3 and maybe 10 on G4.
I agree they are the reason tanks are dead.
if you have a stack in rostov, combined of germans and italians (say 8 italians and 60 germans with 15 german and 3 italian planes within reach), then t you are forcing ussr to retreat to moscow. If they dont retreat, They either have to put 50 units in both tambov and bryansk (in which case they could attack anyways) or they have to put their army in tambov and 10-12 units to block bryansk (or other way around). Then you say “thank you” as the germans and send in 4-5 inf + airforce and kill that stack of 10-12 infs. If they dont have enough, then the italians will kill bryansk, and you can take moscow with your mechs + planes.
as japan if I build 3 minor ICs then I usually mainly buy mechs there, so that I can apply preassure as fast as possible to russia, china and india.
another good use for mechs is; as germany, you need often need 30 units in w/germany, if 20 of those are mechs, and you have 10 planes within range, then you are capable of counterattacking any allied landing with 30+ units. it is cheaper to have 1 mech in w/germany doing the same job as 1 inf in w/germany + 1 inf in paris would do.
to advance in AA, you need to be able to defend the newly taken terretory, this is why mechs and infs are the most valuable units.
If the map had been smaller (like in revised), then mechs would have had a far smaller worth)
then your italians can take out their