It definitely has a bearing on reality, it is reality. What I think you are saying is it should not have a bearing on balance, which I believe is also incorrect.
AT's will always beat randoms, hard to balance around that. You can make allied team work more intuitive and easier to pull off like it is for Axis, but there is still the issue of 3v3 and 4v4 map's being unrelenting shit which is the biggest killer right now.
A good portion of players play 3v3 and 4v4 (~50%) and saying well you should just expect to lose as Allies when you queue up there is not a good strategy for brand retention. Relic should and will be changing things to provide help to these players and make the Allies a more popular option.
Brits should help things, as it will increase the allied player pool (one of the big reasons allies have a poorer time as well is a very tiny player pool). But again the primary culprit here is maps were it's really easy to turtle on.
I also think you undersell OKW in larger games. Yes when there are 4 of them they suffer, but mixed in with Wehr and you have an almost unstoppable force right away. Kubel synergizes so well with Grens. Volks provide excellent mobile AT in conjunction with more static T2 Wehr play. Artillery means nothing with at least one CAS player, build as much as you like for 50 fuel they can blow all the artillery you can build sky high with a click.
What is your explanation for OKW being unpopular in the LoH tournament then? Because I am pretty sure it's due to a couple of factors:
-Just 1 OKW player can provide you with all the counters you need
-OKW is punished a lot harder by Katyusha's and priests which can't be reliably countered with CAS
-Cannot contribute to the construction of fuel and munitions caches
-Jadgtiger is much harder to use than the Elefant
-The large increase in indirect fire makes keeping vetted squads alive difficult and loss of vetted squads is a game killer for OKW
-Easier to be outnumbered, a JPIV is a amazing TD but when outnumbered 4-5 to 1 is difficult to use. Ostheer can rely on cheaper easier to spam tanks.
-Enemy AT is much more plentiful in general, which makes countering the much smaller in number OKW vehicles fairly trivial. Meaning a greater amount of micro has to be invested in keeping your tanks/light vehicles around.