Planes being brought into ground battles are compressed from a scale of 1.0 -14.7 to 1.0 - 13.0. The maxumim BR for ground vehicles is 12.7, so why not push the maximum BR for aircraft in ground battles to 13.7?
Why should the f-15j or mig-29(9-13) have to go against a rafale in ground, while neither have any guided a2g weapons or ARH?
Why should 12.0 spaa like the ItO or CS/SA5 have to go against a su-30sm2 with kh-38 and now kh-31???
If the maximum BR for planes in ground battles was set to 1.0 BR higher than the max BR for tanks, then bringing a top plane would mean forfeiting the chance to get a downtier (which I think is far more than fair), while still keeping normal-ish wait times.
If it was put at more than 1.0 BR higher then bringing a top plane would mean only being put into battles with others who also brought high BR aircraft, as a purely tank lineup would be outside 1.0 BR threshhold. (not exactly a no-plane gamemode but I’m sure plenty of people would be happy)
The resulting decompression would probably see all planes above ~10.0 and most planes above ~7.0 moved up at least one step. I see no downside to this, it would be a healthy CAS nerf, especially at the high BRs where it is needed the most. (plus many aircraft just got MITL and ARMs without any adjustment in BR, so this could help balance those.)
Same thing applies to helis too.