That would be true only if combined axis factions didn't had ALL the tools needed.
They do.
Brits introduce what allies do not have in stock roster, heavy non doctrinal armor, heavy AT and long range infantry. Axis have all of it already, so why do you think there will be a problem?
So you want a pairing of a faction with a currently overwhelming early and mid game advantage, paired with one that has an equal late game advantage and heavy fortifications?
Fair enough.
I await to see how the Axis faction will deal with heavy emplacements given the fact that all of the useful artillery resides in the hands of the Allied faction. I seriously can't wait for mortar pits, boffors, and AT gun nest line with ML-20's sitting behind shelling my base. I am also sure the Brits will get their artillery commander to add to the fun.
I mean most games in 4 v 4 as Germans don't even get to the 20min mark currently, but the ones that do go far enough see the lovely B4 and ML-20 raping begin in earnest.
It will be great to rewind the clock to the "good old days" with Sittard summer being the new Sheldt. It really didn't feel the same without the Brit mortar pits and 25 pounders.