Because revenue is generated by the masses, so the game should be balanced for the masses to be a fun and fair experience. You can't nerf a faction just because it's too good with top player micro and leave the average player to be trashed every game by easier to play factions. Balancing for top players only is a death sentence for the general population health of the game. It doesn't really matter for CoH2 anymore though, but it would certainly be a bad business strategy for a CoH3 if that's ever released.
The game is 5 years old.
It hardly generates any revenue anymore.
If it was otherwise, we'd be getting content updates and commanders, you know, to keep the masses interested.
Few people getting the game in humble bundle or -75% steam sale isn't revenue anymore and bulk of population already got what they wanted, regardless of balance, plus balance never impacted revenue in the first place.
Tiger ace being prime example, even when it no longer was 2500hp, 320dmg 100% penetration on everything behemoth, it still was one of the most popular doctrines in low level players brackets.