Similarly, I would ask you to play 20 games as OH in anything but 1v1 and tell me they need buffs.
1v1 is the least played game mode, balancing to it means the least possible number of CoH2 players enjoyed a balanced experience. Why would we knowingly make the game worse for the majority
Used to be a heavy 2v2 player. OH is in a better spot there, but still very weak against double Soviets, even when paired with OKW.
Anything upwards, as far as I can judge, any Axis constellation is undoubtedly stronger. Accelerated teching and the corresponding irrelevancy of infantry will do that.
As to why "we" (Relic I guess) prioritises 1v1? I don't know, but I applaud it. The things that make the CoH franchise attrative to me just don't really come into play in larger teamgames. Positioning, flanking, unit preservation, army composition, etc. don't seem to matter to anywhere near the same degree. The lategame always seem to degenerate into an unmitigated heavy tank slugfest with all other units relegated to near irrelevancy, and with the advent of OKW that certainly favours the Axis teams.