Yes, the current system makes a mockery of the entire first half of the war; the RN should be a daunting presence. Without a reaction phase, Tdelayed unloading may be the best solution. It's still not complete satifactory because it's doubtful the transports would ever arrive at the English coast to begin with.
The liquidity problem, if it is a problem, hasn't received as much attention. I feel the game lacks smaller units. I loaded the 1942 scenario and the German is hard pressed to cover even the northern front let alone concentrate for the Southern offensive. It feels scattered.
The Player can purchase corps but I don't know if the cost/benefit ratio on a large scale is worth it. We need a sub-unit for amour units as well. Since SC doesn't employ dedicated supply units like WaW this offersa the added benefit of simulating supply build-ups in targeted zones.
There's much in SC2 that I prefer to WaW,; the larger scale and the ingenious expanding seasons. The squares are OK. But I appreciate the intra-turn reaction feature of the latter. Also the supply units contributed, IMO, to the realism, for one thing, making the Battle of the Atlantic less abstract. I've shelved SC2 for the time being.