Sorry Omega, but I completely disagree with you. Yes you need Inf, they have a definitive role, take hits and defend. Artillery is the best offensive bang for your buck, etc.
Here is the thing though, armor only has one special thing about it, its blitz. Mech can move just as fast and are extremely much more powerful on the defense, and with art are sick on the attack as well. Japan starts with 25 planes! Germany will start with atleast 10. At that point you do not need more punch, you need boots, and that is where inf/art/mech come into play. Not to mention the fringe benefits of planes, such as threatening fleets, scramble, intercepting, etc.
In the sea the only advantage a BB/Cruiser have is the shore bombard. Dollar for dollar they are terrible in battle. That bombard is highly situational as the enemy will rarely leave his units on the border to be bombarded. Combine that with the all around better utility of the carrier with planes and you have a lost cause. Even against a territory with an aa gun, the planes on a carrier will bring better odds into a large naval assault and is superior at defending your transports.
Think about it, what is worse, a pair of carriers with 4 planes, or 8 cruiser shore shots, when trying to invade a heavily stacked territory. By round 2 the planes got just as many hits and can be taken as casualties in a close battle. Even against an AA gun on average if the fight lasts to round 3 the carrier out performs. Run the odds if you don’t believe me.
With the loose of the ‘first stike’ ability of shore bombard, cruisers became pointless. The only time the bombard outperforms the carrier is if they are in a naval base and 3 moves away to drop off the troops so that the planes cannot reach.
And on top of that, a singular DD can block as many shore shots as it wants, it has no such ability against a carrier’s planes.
And stop comparing apples to oranges, comparing land units to air units is pointless as they have different roles. The only reason air units are compared to naval units is the carrier. I would almost always take 3 mech inf over 2 armor. I’ll take what I start with but other than that, junk.