It doesn't take more or less coordination
Double kubels openings against allies without m3 player who knows he should concentrate on countering them? Any openings without sov t2 for support weapons and vital early at gun? No double katys or isus to counter blobs? I wish you luck.
Axis is extremely straightforward and strategy rich faction in 3v3/4v4, due to all their strategies being decent on their own. Open with med hq, spam volks with sturm officer, support them with fast jagdpanzer to bathe in mp. Open with double kubels into whatever you want to end game in first 5 minutes. Volks spam again into 2-3 mg 34 into raketens into pak 43 into kt turtling. Kubel double sturmpio into fusiliers spam. Standard 3 volks into rushed luchs and double obers, even jli blobs supported by 2-3 raketens viable. I did all of this, and can assure you that you can do even more, pretty much whatever you want, and if you do it right, you will win. I will not continue on wehr, because wehr have even more possibilities. If you played any serious Axis games post march deployment and prior to wfa, where you can not survive against isu without elefant and against b-4 without bombing-focused doctrines such as cas and luftwaffe supply, you should understand.
On other hand, bad strategy choose for allies is lost game from begining even if they manage to outplay Axis in early-mid game on all fronts considering equal skill. Allies need strong infantry from usf player (browning paras) to deter volksblobs foolowed by jacksons, sov player to deal with blobs (double katys/isu), sov players for early pressense and trucks harassment (double t2), sov player with strong t1 and sniper play to counter kubels and elite infantry later, and PROBLEM IS, they need all of this in one match, and they STILL will be in dire struggle to counter vetted infantry, superior tanks and tds.