I'm actually in favor of lower damage of helicopter rockets vs aircraft, the problem is that was the only thing that got nerfed. Air to air TTK is already insanely fast so having something that could two tap all aircraft (including transport helicopter before it got its HP buffed) was fine since the old damage model was too oppressive. DICE nerfed heavy rocket air to air but left little bird with 7 light rockets that fire in pairs of 2 that deal 225 per rocket, can be dumped in 1 second if you mash fast enough, and have a total damage cap of 1575 meaning it kills even the buffed transport at full HP without ever needing to touch its main gun if it lands all of its rockets. And it's not really that hard to do on a big slow moving target, especially if it's firing at you meaning you can aim at the entire broadside of it for an even bigger target profile. For other helicopters you don't even need all 7 rockets to hit, and whatever you miss you just clean up with the guns anyway. That's why the Little Bird is the top heli right now because of how quickly it destroys its competition.
In general current air meta is whoever ambushes the other party first is almost guaranteed to win due to fast deaths and insanely crippling disable states that remove the ability to fight back or flee. Disable system for aircraft needs to be removed or toned down a lot to put some actual dueling back into the game again.
however the gunner still deals the same damage to jets, immobilizing and killing them insanely fast yet again)
DICE actually tweaked attack helicopter gunner cannons this patch, no idea why. It now deals 88 to helicopters and 110 to jets, when before it was a flat 100 to all aircraft. It doesn't change jet breakpoints for bullets to kill, but it was a slight nerf to destroying other helicopters.