Have we ever talked bout the heli's rank before? It seems that the heli's rank is a bit 'out of date' now

Now the game allows us to research the helicopter tree through ground battles, but the efficiency is quite low. I mean, not talking about the economy, which im actually quite satisfied with, but the rank.
Now we have rank 8 for both ground and air, but not for the helicopter. Players will face an at least 10% nurf in rp when using the 11.7 vehicles, since 11.7’s helicopter is all Rank 7, and the efficiency will drop to 40% when researching the 11.3/11.0 helicopters in Rank 6.
So when or whether shall we have an ajustment on the helicopter tree?