But that sentiment is not entirely false. Only ost is somewhat different from the rest.
Only the Ostheer and Soviets are standard build Armies, like the US and Wehrmacht in the original CoH so they're quite similar to each other as I said before with each having their own specific and unique counterpart units which prevents a mirror match like most people are afraid of.
The rest of the factions are weirdly designed in my opinion and trying to forcefully be "different", as in the reason why we got both British Armies being focused around static defensive emplacement gameplay or both the PE and OKW being the "Elite" more vehicle focused factions.
What should have been done in my opinion was go for a theme and stick to it, for example I think it was well done in the original CoH with the US and Wehr representing their real life 1944 counterparts well while in this game the Ost is some sort of mish-mash 1943/1944 defensive Army while they should be an early war more mobile and aggressive Army with the OKW's trucks instead to represent the "Blitzkrieg" time of most of the Theater of War missions for example.
The Soviets are... fine I guess altho if the Ostheer was more accurately modeled during the early parts of the war then they too should have been done so with a bit older vehicles and weapons.
USF are probably the poorest designed faction just because of their limited options and unpractical base design. Their concept was a force that "bends but doesn't break" at the start but I think it kinda died off with the removal of the rifle smoke, not to mention lack of an actually normal MG like the M1919A4 instead of a .50 cal which makes no sense to be carried around by a bunch of infantry which need to be bodybuilders in order to actually do so in real life and stuff like the M20, M15, M8 and M36 being standard vehicles while the M10 is not or the lack of a 76 Sherman upgrade again which doesn't make sense as well for a 1944 US Army, no M18 Hellcat too which was one of the most effective TDs of the war, no Jumbo which would have fit more for again a 1944 US Army instead of the Pershing which saw extremely limited service in 1945 and so on and so forth.
Then we come to the OKW which again, it doesn't make sense for a 1944 German Army to be so aggressive and focused on the early part of the game when they should be a more defensive force with concrete buildings and so on. Their whole design also went out the window with the removal of the fuel and ammo toggle mechanic at their Mech HQ, I mean why not just give them resource caches at this point as well?
And lastly the British, which with their Comets are meant to represent a British Army in 1945 on the Rhine but instead they're again limited to static emplacement gameplay with the mortar pit especially and no mobile non-doctrinal mortar team to rely upon as a cheaper means of indirect fire like the rest of the factions.
One could argue that yes, the same thing did happen in the original CoH with the PE and Brits being forcefully "unique" altho the themes of said Armies did make a bit more sense with the PE being based on the Panzer Lehr Division in OMG while the British were more defensive oriented because in real life they took up the brunt of the fighting in Normandy until the US could break out of the hedgerow country and into more open ground but in this game again at least in my personal opinion, the Army designs lack any such sense with only maybe the OKW being ever so slightly at least somewhat faithful to the 1944 German Ardennes push but even so their entire HQ system again makes little to no sense.