@The-Janus
I’m not an expert, but I do have some thoughts on your thoughts:
I think you’re seriously underrating artillery. While I agree that tanks are the best buy for the US (though not the UK-if you’re doing “Middle Earth”, where you dump a bunch of minor industrial complexes in the Middle East and Egypt and mass produce ground units and march them up to the Soviet Union, they’ll be cash-strapped enough to need artillery, and the Middle East to the Eastern Front isn’t terribly far), as you mentioned, they’re the perfect option for large land powers like Germany and the Soviet Union. Keep in mind that artillery is way more cost-effective than tanks in terms of sheer firepower. 9 infantry and 9 artillery (63 IPCs worth of units) have a 70+% chance of winning against 6 infantry and 6 tanks (63 IPCs worth of units) regardless of whether either side is attacking or defending. Because of this, if America is focusing more on delivering troops to Europe directly via transports (rather than your strategy of moving through North Africa to the Eastern Front), artillery could still be valuable to provide more cost-effective firepower, since Western Europe is so dense that 2-space-movers aren’t very useful. If we’re going directly after Western Europe, I’d rather have 8 infantry, 8 artillery, and 8 transports (112 IPCs) rather than 7 infantry, 7 tanks, and 7 transports (112 IPCs).
Your view of mechanized infantry is mostly correct. I do think Germany isn’t as hard-pressed as you think and can afford them (and they’re an absolute must if you’re preparing a giant assault on Moscow on a specific turn).
Tactical bombers aren’t very useful in Europe because carriers aren’t very useful there.
You’re right about cruisers, and others agree with you (https://www.axisandallies.org/forums/topic/35286/warfare-principles-of-axis-allies-by-andrewaagamer/4?page=1, https://www.youtube.com/watch?v=u_P4GK8o2kE). Some people this was intentional to simulate how they and battleships were obsolete to make the game more realistic.
Yeah, convoys are messed up.
I think that a Baltic fleet for taking on the USSR is useful, but there are far better things for Germany (though a navy built for other purposes, for example Sealion, would be an excellent resource against Leningrad).