This is so blatantly wrong I don't even know were to start. Conspam is powerful because it counters the Kubel and sturms. Sturms can't DPS/kill you if they can't close the distance between you before losing their models and the Kuvel isn't hard to overwhelm when you have Oorah!
Riflespam can be semi-less effective due to not having the numbers that Conspam does, but early nades help immensely. OKW early game by design is anemic, they start with the least MP of any faction and the least capping power.
EDIT: And deal with maxims to a point? Christ dude this is cringe worthy, your only going to be able to beat his maxims if he fucks up microing them. OKW doesn't have a early game firepower advantage at all.
Allies have the early game advantage where they can expand all over the map while Axis has to slowly expand outwards. The big weakness of axis early game is their lack of early game AT. USSR scout car & USF utility car can bully for a while before axis is able to get AT to counter.